Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa86257cdb4dff00…

MALICIOUS

PDF

69.8 KB Created: 2021-06-07 19:35:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 9840449926923e7910bc4e2b104233fb SHA-1: b045376252053641e37b937baaadea3fcab98da9 SHA-256: aa86257cdb4dff00261bf42e1424b0477d66de375534c6690adde1bb608e1491
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-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.
  • 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://vilenefex.ru/123?utm_term=oval+bassinet+fitted+sheet PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4387815/normal_602a55bb142ce.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491152/normal_603f4e8db4900.pdfIn PDF document text
    • https://gimepaponu.weebly.com/uploads/1/3/4/6/134614910/gofisumebuvefijop.pdfIn PDF document text
    • https://sufafiderek.weebly.com/uploads/1/3/0/8/130814754/jebexexizerasifi.pdfIn PDF document text
    • https://tagorawijetix.weebly.com/uploads/1/3/5/3/135392874/ad0411c3a4.pdfIn PDF document text
    • https://zolopopi.weebly.com/uploads/1/3/3/9/133999976/loleruwum.pdfIn PDF document text
    • https://fubafutevulaz.weebly.com/uploads/1/3/1/8/131856433/dekumolubazu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422144/normal_6014276a65fbb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452373/normal_5fceaa67cf1c6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tusawijer.pbworks.com/w/file/fetch/144450492/71758144382.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cdf99aa2-572b-4b24-8f62-9624298fe907/94595731535.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/71184d3d-8230-49ee-bb65-9a1fbdecb6fd/how_to_teach_character_traits_first_grade.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/497ed62f-49f6-44d1-94fe-75efbb1bc5be/giwurifadowuloju.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/431be19d-31b9-4961-b156-52d8db1c7ba4/nitonolumagidilu.pdfIn PDF document text
    • http://xojifot.pbworks.com/f/how_to_reset_tzumi_sound_mates_no_buttons.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/221fb926-dedf-4818-a1e6-98bdfbc12862/ny_lottery_take_5_payout_for_2_numbers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bcc0996c-13b0-423f-850c-45782585d4dd/lenovo_ix2-200_firmware.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/57b70f28-3ef6-4791-83fb-a6960067bdce/virexotepaz.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_off0000d1c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1C0 5128 bytes
SHA-256: 33eada959f6cd31446890ba355e934bb867dd249e24974bbdb20df55222db0b1
font_01_sfnt_off0000e32e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE32E 11412 bytes
SHA-256: 446253c46e824493cc2e8457bbd7598e50f573393394b26e9fe20491b8d59526

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