Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b7db0a79881caa9…

MALICIOUS

PDF

87.2 KB Created: 2021-02-27 04:24:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: ce75c55d373f54b4b9883464f119d6bd SHA-1: 4963bc404f615fb96e9b815d6e2de6c1c2fc7e6e SHA-256: 8b7db0a79881caa91971d4606c60ac78c9193c21730681e86385db21129baa66
96 Risk Score

Malware Insights

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

The PDF contains a heuristic firing indicating a link farm with numerous external PDF links, suggesting a malicious intent to redirect users. The embedded URLs point to various PDF files hosted on services like Weebly and S3, likely serving as a distribution mechanism. While no scripts were directly extracted, the PDF structure and the presence of many external links strongly suggest it's designed to lead users to malicious content or further stages of an attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • 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://dugedepap.ru/123?utm_term=the+complete+earth+chronicles+review PDF link annotation
    • https://dowolozudatu.weebly.com/uploads/1/3/4/0/134000293/tuforuvuwiruti-jujexir.pdfIn PDF document text
    • https://bunafigokakataw.weebly.com/uploads/1/3/0/9/130969192/5139446.pdfIn PDF document text
    • https://xonuguzuv.weebly.com/uploads/1/3/1/3/131382030/wijesinilukuk.pdfIn PDF document text
    • https://cdn.sqhk.co/xogudililavo/idIibSN/sapuvumusufovo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423155/normal_603051a1942bf.pdfIn PDF document text
    • http://sevowina.medianewsonline.com/become_a_spiritual_life_coach.pdfIn PDF document text
    • http://worameruvejaka.mywebcommunity.org/what_are_the_mythical_monsters.pdfIn PDF document text
    • http://zikewexer.scienceontheweb.net/fulimodefejaz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476947/normal_5fc7d9f3beef7.pdfIn PDF document text
    • https://mogekalama.weebly.com/uploads/1/3/4/7/134741787/kaluv_falixe.pdfIn PDF document text
    • https://cdn.sqhk.co/gesaxamadew/igjamlg/68872411824.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488566/normal_602650656a67d.pdfIn PDF document text
    • https://cdn.sqhk.co/venitalobeni/FjaXzVq/crypto_wallets_list.pdfIn PDF document text
    • http://gatowixipeba.mywebcommunity.org/91066027794.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://s3.amazonaws.com/wejuvono/pivegutomanuw.pdfIn PDF document text
    • https://s3.amazonaws.com/nilafafakem/zilupafegejenejiwepe.pdfIn PDF document text
    • https://s3.amazonaws.com/fedufiporara/lagu_cakra_khan_kekasih_bayangan_free.pdfIn PDF document text
    • https://s3.amazonaws.com/fuvidokibet/pigubisebenipizalanuderab.pdfIn PDF document text
    • https://s3.amazonaws.com/betefowubevat/bootleg_movie_sites.pdfIn PDF document text
    • http://zupitatip.atwebpages.com/criminal_law_definition_australia.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010a81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A81 5064 bytes
SHA-256: b266b26d2a918185aec09e67f9c7a9bfa13820d2b23e58794762c4d534b00edc
font_01_sfnt_off00011b91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B91 10988 bytes
SHA-256: e377c2ffdeab20cb80bbca91358072289a7c981bd53a0f99a7d5c3dc0faaee2c
font_02_sfnt_off0001411e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1411E 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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