Malicious PDF — malware analysis report

Static analysis result for SHA-256 f958a8b9c2aa7d1f…

MALICIOUS

PDF

83.5 KB Created: 2021-03-08 05:07:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: c3250836a38651c76959814aaab63739 SHA-1: 58f15cb22fcb50c8d75c6edef0c5001e1fe4c03f SHA-256: f958a8b9c2aa7d1f39086f47327f747231818ab3ee1828e53eea6776378c29f1
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous external links, a common tactic for SEO spam and phishing campaigns. The ClamAV detection and ML classifier strongly indicate malicious intent. The embedded URLs, particularly those on disposable hosting, suggest an attempt to redirect users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://pelibifir.ru/wb?keyword=digital%20zoom%20photo%20meaning PDF link annotation
    • https://vibofizetukoz.weebly.com/uploads/1/3/0/9/130969748/fazekidu.pdfIn PDF document text
    • http://wikotimu.scienceontheweb.net/how_to_fix_lg_monitor_black_screen.pdfIn PDF document text
    • https://vazanekufom.weebly.com/uploads/1/3/5/3/135322674/859246.pdfIn PDF document text
    • http://kaboliwup.mypressonline.com/gunujose.pdfIn PDF document text
    • http://raxawevamavox.getenjoyment.net/bugupoborugadapi.pdfIn PDF document text
    • https://kamukijupekud.weebly.com/uploads/1/3/3/9/133997827/kulujodakikedowataz.pdfIn PDF document text
    • https://wizawexixif.weebly.com/uploads/1/3/4/4/134472694/fokabujepu-kosura-keleparojirina.pdfIn PDF document text
    • https://jipofaxinevafud.weebly.com/uploads/1/3/4/3/134350183/babesopepebisa_wuwatadutakow_rikorimutenox.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://76b44699-1094-4fd8-8d4a-70b7be8159c3.filesusr.com/ugd/c450b2_70d19ace82484cbc907e3091d034f303.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca1453be-facd-4777-bc6c-df3438d8d42d/66640312173.pdfIn PDF document text
    • https://87b84290-c0b3-4c73-97a1-3d59c64c3f69.filesusr.com/ugd/c638b7_88499ee5de0543ceb82270d52a418911.pdf?index=trueIn PDF document text
    • https://0a497e50-07dd-462d-832d-d8678f741a8e.filesusr.com/ugd/5f857b_fa1d7d07e32745e79c3394340a94795c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3ee943bc-63e5-401c-9aa2-b72023a5e6b9/what_is_ati_nursing.pdfIn PDF document text
    • https://01d7ec8a-e38e-4e33-8c76-1be31754498b.filesusr.com/ugd/24d943_afa9a5900f9441da9a376748511236ef.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/67467064-13af-457c-ad75-4efdd0d0cc2a/how_high_on_the_wall_should_a_carbon_monoxide_detector_be_mounted.pdfIn PDF document text
    • https://972af30b-04c2-4618-b911-83ba0b7fef9e.filesusr.com/ugd/84a5c6_91572c238b004a72926f2b0c1e2b01fc.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xamibebulosaxug/93181868327.pdfIn PDF document text
    • https://s3.amazonaws.com/vunizi/razotagasit.pdfIn PDF document text
    • https://387a498e-9551-4239-9507-3183ba214552.filesusr.com/ugd/cd403b_27a1ada0b96644cfb4f29b2fe08803a8.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kovezodepugov/mabapuwebugidogonexinomus.pdfIn PDF document text
    • https://s3.amazonaws.com/semuxemakaw/forbes_travel_guide_five-_star_awards.pdfIn PDF document text
    • https://2080fafa-2491-4ac3-8118-a138f33bff34.filesusr.com/ugd/822ecd_32ad5868ceb046398cd4fa18fa156132.pdf?index=trueIn PDF document text
    • https://12f7643e-9106-4823-89c2-0bdaecd1bc22.filesusr.com/ugd/1f6d71_5f38a3cbedcf434ba65a42bc289b4fed.pdf?index=trueIn PDF document text
    • https://4095172d-bd2f-4181-91d7-dd424e653400.filesusr.com/ugd/df73ab_8695e0d2e8cb4f0db4d53f85c929a2cb.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2bacea9c-ac8d-4fb3-b306-65bfccf1ad60/dorothy_must_die_stories_volume_1.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/44961c48-137c-4b91-aff4-0ec29589dbc9/how_to_reset_airbag_light_on_2005_chevy_cobalt.pdfIn PDF document text
    • https://cceb078e-1df6-42b0-9e12-359f30e42f1d.filesusr.com/ugd/e8506d_00622c2146cc4527b8a9e0deab10aab6.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fb28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB28 4796 bytes
SHA-256: 445c1653448b2285deb381e229cc0ca98b6753bef8068ba390814fcd1b396a8e
font_01_sfnt_off00010b5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B5D 11516 bytes
SHA-256: ec3c7527508a6a3bac62e781ff98e05f07d70155a16ead7eaefcea2d3273e6ce
font_02_sfnt_off000131cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131CB 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c