Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a4ff1ab69eb29eb…

MALICIOUS

PDF

85.4 KB Created: 2021-04-14 04:50:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: cd76e98fcf51d23d26eb2ef9568947d8 SHA-1: e74d25d7fb096de2bf65a0dea437761175f14ffb SHA-256: 8a4ff1ab69eb29eb6f4a7bfb63fb0fd2bdc37d2035612875750d32bfb81d9989
186 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 0.9998

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://nipisod.ru/strik?utm_term=edenpure+gen+4+parts PDF link annotation
    • http://jaralet.getenjoyment.net/garmin_vivosmart_3_strap_replacement.pdfIn PDF document text
    • http://pogawubujogeje.mypressonline.com/kapodevexeru.pdfIn PDF document text
    • https://forugizatufuru.weebly.com/uploads/1/3/1/4/131410167/1006266.pdfIn PDF document text
    • http://fanilobepewe.sportsontheweb.net/monster_2003_where_to_watch.pdfIn PDF document text
    • https://kedefakoriwo.weebly.com/uploads/1/3/1/1/131164231/mokororuxavuzogojo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411503/normal_604f019149620.pdfIn PDF document text
    • http://tifoxikutawe.sportsontheweb.net/gibafugilebixowupukokes.pdfIn PDF document text
    • https://dotobepe.weebly.com/uploads/1/3/4/6/134680180/916497.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366014/normal_5fc871037a94d.pdfIn PDF document text
    • http://wijasagasipode.getenjoyment.net/worship_matters_bob_kauflin_free_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420765/normal_601de66c4a271.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417645/normal_5fddbc3eb29d6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413713/normal_601a670573f6a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385880/normal_6021bdc09b7a5.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/9f936c81-2568-4a27-ad11-2e3c1a824c3a/james_patterson_first_book_alex_cross.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/31981e03-542c-45b1-8de1-b11d93eba67f/best_measure_theory_book_for_self_study.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2ec8c66c-4125-4c86-b2ba-ce2afe55f9de/how_many_words_is_a_harry_potter_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/11b5b53c-8edc-459e-b5f3-be212e6b5130/how_to_fix_tv_remote_controlled_rotatable_digital_antenna.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c627421c-b810-462d-bf40-f847c0e4bbb1/chinese_characters_to_pinyin_with_tone_marks.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/55b4d7d8-178a-4efc-a977-6053ef9b414c/64173526758.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_off00010dac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DAC 5140 bytes
SHA-256: 5eef7e3ae01c3e2a565c620378276c9165a395f9245aa834d6b67cdfd0a9b47c
font_01_sfnt_off00011f3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F3F 12468 bytes
SHA-256: 9cdf90dba376c1a4c5a81f1f9cdc0c314c0d8c34e4ee5443be167baf7ca8c525

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