Malicious PDF — malware analysis report

Static analysis result for SHA-256 511c1dd4427390c1…

MALICIOUS

PDF

85.7 KB Created: 2021-04-06 21:47:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: a3820d2c88b2d05316355264f16a29a5 SHA-1: b070f246961f3618f9d0568de39e494f9627fb73 SHA-256: 511c1dd4427390c1f260d752c56486589d99f3ba61144a30b79eb83bcbb9115c
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 0.9996

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 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://dafemum.ru/award?keyword=english+test+for+8th+grade+pdf PDF link annotation
    • http://nirenodeba.medianewsonline.com/63146839599.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367279/normal_6067791c00c65.pdfIn PDF document text
    • http://bluebadgeform.com/types_of_public_policy_analysis0tyub.pdfIn PDF document text
    • http://xamawigokoke.mygamesonline.org/30700340371.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378157/normal_605dd3e4c8abc.pdfIn PDF document text
    • http://zutixononazetu.iblogger.org/76667876934.pdfIn PDF document text
    • http://bitjoms.xyz/sexurep3zskh.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374704/normal_60445d6c9c35e.pdfIn PDF document text
    • http://nexofozupugasi.mywebcommunity.org/1496386553.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fonovituten.rf.gd/jexumavezuxiv.pdfIn PDF document text
    • https://d046670e-94b8-4ea2-8efc-69fca9b502c9.filesusr.com/ugd/c0b427_b857b1c5efd4418582553baa930074ae.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e24c4ead-f365-4c78-ab3c-a105229da967/how_to_replace_bearing_on_washer.pdfIn PDF document text
    • https://c0771fee-1ba5-4dbf-bba5-a775c3d44c03.filesusr.com/ugd/544e7e_e0b99936e73c4a399b56602f62b1d0eb.pdf?index=trueIn PDF document text
    • https://f26e6bca-ce10-4524-9610-ed5ef7c8d48b.filesusr.com/ugd/ac8c68_afa2beb6e1e74b2fb768042d7db31d36.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1068c4b3-500d-473c-8d1d-4dc0730c4f59/xekugavizuvatedozaj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f71aa0e7-eabb-4081-8a39-5d2a46a10d95/pennsylvania_district_attorneys_association.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/75d3dcb0-8d4c-40b7-b5d2-e05fb54773b7/how_far_below_the_axis_has_the_electron_moved_when_it_reaches_the_end_of_the_plates.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c8fc52e3-27b9-4765-9c54-a8e43289a038/jilajejepepuguxasukovibo.pdfIn PDF document text
    • http://mirijevedot.epizy.com/acceptance_and_commitment_therapy_techniques.pdfIn PDF document text
    • https://3b9c8e93-52ab-41e8-96f8-e5fc639bf6fa.filesusr.com/ugd/fe3ccd_5d14925b368f49b4828097d941038069.pdf?index=trueIn PDF document text
    • https://6c892e0d-5736-4b4a-96a3-cd490fd1fe3d.filesusr.com/ugd/1407cd_848cce2bf81e4e7f88819f678b647a6f.pdf?index=trueIn PDF document text
    • http://romofimor.onlinewebshop.net/45941761473.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_off00010d79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D79 5456 bytes
SHA-256: af96f3126717d06fc490fba54a2a08ebd2ac78a6a522803f52f0d118a30fd726
font_01_sfnt_off00012009.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12009 12276 bytes
SHA-256: 566d657eee4863d25d5d6c763a8fe4891ce7ba16eed7cbc5efd0f5284f98f4a1

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