Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac86af5637aa6d96…

MALICIOUS

PDF

76.7 KB Created: 2021-03-13 17:13:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: eebea7e792d85fbf792713d1ce5020c3 SHA-1: 9a7844a7c8584efa55845a73de8f959ac68bd3d5 SHA-256: ac86af5637aa6d96e3a0bbce96c943cdbd3a6e880f0d0501eb86248baa429b9e
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9991

Heuristics 5

  • 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 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://xajibur.ru/wix?keyword=500+words+2020 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4386836/normal_5ff20b2b85908.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490123/normal_601621ec6049c.pdfIn PDF document text
    • https://rojisubul.weebly.com/uploads/1/3/4/5/134593633/2011802.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381964/normal_5fe7735ed9eba.pdfIn PDF document text
    • http://xurufotuzu.iblogger.org/siwimimukebefijo.pdfIn PDF document text
    • https://lifitexuga.weebly.com/uploads/1/3/4/3/134356919/8789029.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379720/normal_6026ea0f5df18.pdfIn PDF document text
    • http://899themes-demo.ru/kavegaxudopopemewijifqezoh.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376625/normal_5ff1f58fc7ff2.pdfIn PDF document text
    • http://becloud.website/pivavoxhgl3w.pdfIn PDF document text
    • http://mp4.design/13559652014alx.pdfIn PDF document text
    • http://vatamulejuvovi.22web.org/what_rank_is_lsc_in_the_navy.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455658/normal_5ff56f3d7029f.pdfIn PDF document text
    • http://natikolom.site/nawenudoreruuy2oc.pdfIn PDF document text
    • https://bivesazi.weebly.com/uploads/1/3/4/6/134652180/160b455d66c.pdfIn PDF document text
    • http://matcobzor.ru/are_all_religions_based_on_loveb4a7q.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476582/normal_5fd281b4325a7.pdfIn PDF document text
    • https://fezojeme.weebly.com/uploads/1/3/4/6/134614855/2999467.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/lawakux/low_back_pain_and_sciatica_nice_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/sezewu/55055620866.pdfIn PDF document text
    • http://xofebobijo.epizy.com/how_many_cards_in_a_munchkin_deck.pdfIn PDF document text
    • http://gexazavere.epizy.com/72952252766.pdfIn PDF document text
    • https://s3.amazonaws.com/kefodek/free_printable_boundary_worksheets.pdfIn PDF document text
    • http://tofarogupa.rf.gd/43009729037.pdfIn PDF document text
    • https://s3.amazonaws.com/jiwotarotavuz/windows_booting_software.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_off0000eed4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEED4 4972 bytes
SHA-256: 6b1f9ddd04efd95c237221d49563c9948d663c7be4777fed32b9358c5ecc320e
font_01_sfnt_off0000ffe3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFE3 10612 bytes
SHA-256: 850002575d460276a2a21041d4108518d05588a152c5311efd72f7f2fd53c070

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