Malicious PDF — malware analysis report

Static analysis result for SHA-256 087e53eaa7a8a559…

MALICIOUS

PDF

76.9 KB Created: 2021-03-21 05:27:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 5b5c032047ed8a68351985fba52b7a49 SHA-1: 5af9624ba39143489e06250087da2528999c0f57 SHA-256: 087e53eaa7a8a559c4cb507094bae33caebc61e2d4be31a738b84a6ffc2e054c
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://jumiwimov.ru/123?utm_term=commandos+like+game+android PDF link annotation
    • https://tixaxofafebefut.weebly.com/uploads/1/3/4/6/134634111/wulesonadugulob_zumegudijogu_wubure.pdfIn PDF document text
    • http://hisgohar.site/cuanto_es_1_125_pies_en_metrosplq9v.pdfIn PDF document text
    • https://supuzuvafexag.weebly.com/uploads/1/3/5/3/135383103/pevida.pdfIn PDF document text
    • http://bluebadge-support.com/bowers_wilkins_px_instruction_manualvx026.pdfIn PDF document text
    • https://gidapozu.weebly.com/uploads/1/3/1/3/131379371/1337263.pdfIn PDF document text
    • https://vabisoxapulaji.weebly.com/uploads/1/3/4/4/134444495/d88bb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/3087a55b-03d9-4e54-8d47-8b5f5b0b9448/rifexakudegizuzakemog.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c473874a-aacb-41f5-8513-f65531a7457e/harry_potter_books_in_length.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/236bd44c-3cd9-4cc9-b3ed-c8399bc796e3/ram_dass_death_date.pdfIn PDF document text
    • https://s3.amazonaws.com/kisimujuk/arcade_fire_her_sheet_music.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5021d662-4464-42f6-8838-08276389d3bd/graco_my_ride_65_recall_2015.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f385f999-590a-4e99-982e-f26bfcd0907b/jukovavejupox.pdfIn PDF document text
    • https://s3.amazonaws.com/lupuvogotog/business_plan_template_south_africa.pdfIn PDF document text
    • https://s3.amazonaws.com/tazopaju/simpson_honda_pressure_washer_3000_psi.pdfIn PDF document text
    • https://4ad55601-b8ab-4ae0-bc0e-e90069072326.filesusr.com/ugd/3aca14_033782f768bd4436ab383655b033e375.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nojemi/92110893190.pdfIn PDF document text
    • https://s3.amazonaws.com/fapaga/how_to_win_arguments_william_rusher.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5060e1ca-8df3-499d-9d48-825f1f7e9525/what_books_came_before_the_bible.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/14b69309-438b-4bc8-a558-247a71c806b8/panasonic_viera_42_inch_led_tv_reviews.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8d3da8ec-21e2-4b7a-afa8-0d57813d491c/baby_girl_names_that_start_with_ken.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a60ed05-e228-48af-9b5e-4d3f0701a60e/what_time_did_the_stock_market_close_today.pdfIn PDF document text
    • https://584abdf6-e408-48d3-a53c-4313a8f82471.filesusr.com/ugd/18ee90_9beffd89fe4349999e3c880744582151.pdf?index=trueIn PDF document text
    • https://44bb6ee8-a0fe-4f72-890f-0f0a2fec05cf.filesusr.com/ugd/b65acf_43fc28537af64f6fae395e7ded8d2b7d.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF22 5112 bytes
SHA-256: 66a54ac27d89d3b5cfb9fe52c7bbd5b78af03a8fe64f3a9f8d92246aeeb1ba1d
font_01_sfnt_off00010066.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10066 10648 bytes
SHA-256: f79d972afb52eb16e874c947e877bfda3f1e161f4d013bcc5e9f05510dc72af7