Malicious PDF — malware analysis report

Static analysis result for SHA-256 35ce9848df59bb08…

MALICIOUS

PDF

98.0 KB Created: 2021-03-31 15:02:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 1828cf3bf4083d10d4c42a9d908eb4f3 SHA-1: 4fca8d20924188e54a541e2864a5815f8c80d544 SHA-256: 35ce9848df59bb0840bbf897bd516c7bb27c916bbd4937e785b27f84593e8d64
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://maypoin.ru/wix?keyword=bcat+rbt+study+guide PDF link annotation
    • https://finedogu.weebly.com/uploads/1/3/4/7/134749629/8200323.pdfIn PDF document text
    • https://wivozodibadire.weebly.com/uploads/1/3/0/7/130775536/5099437.pdfIn PDF document text
    • http://tujubiluwanodof.22web.org/3d_photo_editor_for_android.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://77abcf6a-1f47-4233-a5f7-28832101be0a.filesusr.com/ugd/e29e5c_2d374385d49b4f879b51cfe9d7f3db6a.pdf?index=trueIn PDF document text
    • https://d8acad56-eb9a-42d1-a06c-a695c5b02328.filesusr.com/ugd/0ad6c7_eecfe20ae0354da7b422d06e09e2798e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/10003e04-190e-4a6e-9035-f15ce8cf788a/sigelei_30w_mod.pdfIn PDF document text
    • https://19508648-7f28-415f-8121-b57715dc1465.filesusr.com/ugd/9734e7_380b4df0ad2643d6846f1a86cf9ac3e5.pdf?index=trueIn PDF document text
    • https://69f6cc44-9198-4e41-bafa-43503dba92bf.filesusr.com/ugd/dec231_38148c03b17645cabd8839713263ab5d.pdf?index=trueIn PDF document text
    • https://41c240d9-b4af-4f88-8fa4-2a41cce3a287.filesusr.com/ugd/01bc73_0c0d28eecf70426ea64782beaaa9dab1.pdf?index=trueIn PDF document text
    • https://f39f7cea-6337-46de-af4f-699959e6db0a.filesusr.com/ugd/004672_ca9fdbd6349c449cadb8a5a9a6d63a0e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/12fdfa8b-bd21-4220-930d-ca5f844426e8/luzifutapoli.pdfIn PDF document text
    • http://zitorosenexof.epizy.com/synonyms_and_antonyms_exercises_worksheets.pdfIn PDF document text
    • http://joxumokuri.epizy.com/bejenamekif.pdfIn PDF document text
    • http://woxesuguve.epizy.com/beats_pill_wont_charge.pdfIn PDF document text
    • https://6d706a39-1f93-4f1a-9423-caccf7e65e71.filesusr.com/ugd/69f91f_6c438d3fca4e4615a56f250f36e3663a.pdf?index=trueIn PDF document text
    • https://917ed8d3-8a9f-4c5c-a3ad-554e533308ad.filesusr.com/ugd/a4e402_592a3a662db54c39b07f9ef72478ba5d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/21528c95-2566-463e-b315-346341eade88/govesunoduwujatajul.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_off00013cfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CFA 5368 bytes
SHA-256: cc338357a52c37a082d9b303e21dd91712fac8faa0dbcd3346c0bfdc6ebea2d7
font_01_sfnt_off00014f4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F4C 13080 bytes
SHA-256: 8b64c69ffc3765a7c6f45782de97f1bde4d205900627d006a55f5fdf414a11c5

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