Malicious PDF — malware analysis report

Static analysis result for SHA-256 4640031ceb37ee45…

MALICIOUS

PDF

79.6 KB Created: 2021-04-12 16:57:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: daa19dbf1151b521fb6c6c9606f22b1e SHA-1: 56b087d16b050163f764ef6cb070859a1693b60e SHA-256: 4640031ceb37ee45f1ec1eaec8f8f0a36664f3adcabe2346fc4b70343ef390f6
156 Risk Score
Tags
free-cdn-ebook-manual-lure

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 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://seumenha.ru/strik?utm_term=how+to+fix+washer+not+agitating PDF link annotation
    • https://cdn.sqhk.co/nawamuzimosu/bVUjija/editable_curriculum_vitae_templates_free.pdfIn PDF document text
    • https://cdn.sqhk.co/xoxamomajil/ndjgsjg/39100872417.pdfIn PDF document text
    • https://cdn.sqhk.co/zebimapajod/bqgh9hi/74953796218.pdfIn PDF document text
    • http://study-english-04.space/40550419583gr2nj.pdfIn PDF document text
    • http://casbah2point0.com/place_value_through_thousandths_worksheetstw4x0.pdfIn PDF document text
    • https://cdn.sqhk.co/zaviresodew/hdDjehi/the_walking_dead_season_2_episode_2_soundtrack.pdfIn PDF document text
    • https://cdn.sqhk.co/fuvazuginu/dzqB8jb/kokeloxuwofanatefetateno.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/bodajaku/63988395876.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6343966c-8498-483f-a431-9ed593462597/seguzudulilujuxaguj.pdfIn PDF document text
    • https://s3.amazonaws.com/fomudebipefasu/hungry_shark_hile_apk_indir_android_oyun.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2bfb2698-af04-44b0-9f94-0b5273b910a7/61144340247.pdfIn PDF document text
    • https://s3.amazonaws.com/zonebon/ubuntu_14._04_64_bit_iso_image.pdfIn PDF document text
    • https://s3.amazonaws.com/fogibi/25783908114.pdfIn PDF document text
    • https://s3.amazonaws.com/wupuxus/konopugifonerinawidopobor.pdfIn PDF document text
    • https://s3.amazonaws.com/panalipolifod/examples_of_cereal_box_book_reports.pdfIn PDF document text
    • https://fec450ea-b80f-4746-b851-35139cc02de5.filesusr.com/ugd/53a83b_6c7d1d2458f84ebc8dc891916d0133e4.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6a4f4767-a8f6-49b3-b9f0-3abbe683a603/bubebukizor.pdfIn PDF document text
    • https://da550aaf-34ae-4f9b-ad82-7836b82beebe.filesusr.com/ugd/a203e6_8f5ba126cc0b45b08adf452d9a69a789.pdf?index=trueIn PDF document text
    • https://8a89c5bc-485b-4808-980c-66c60e8d9908.filesusr.com/ugd/834936_348f1a1022ba4191b58379244b055303.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf11d2d6-e57d-478e-880a-a9fce2ec2843/21795878261.pdfIn PDF document text
    • https://s3.amazonaws.com/mikibetiv/tadoredunaforonogevu.pdfIn PDF document text
    • https://63c5840e-267c-49ed-94d3-fc9f9d8b9c0b.filesusr.com/ugd/8c5bc8_ac58d576087242b7a4390da6079183b2.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vogubivajavofu/wibabawadevasidogobepoma.pdfIn PDF document text
    • https://8d2868a3-57b7-484c-81f6-493c1c4f5daa.filesusr.com/ugd/a8ca0f_13ef049d7623490eb7dec468776b961b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gofiguj/51684004886.pdfIn 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_off0000f7d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7D9 5120 bytes
SHA-256: 5ac052c65ec784fa8a098e610af8b0619a727c5b6ef5293300aaf9e90838d879
font_01_sfnt_off0001095a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1095A 11068 bytes
SHA-256: 768afa90ac6d4d7d878cb6759a183c51e77f542a23dcc557fd500362f0e2c5a2

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