Malicious PDF — malware analysis report

Static analysis result for SHA-256 a38c604c3bde9cd7…

MALICIOUS

PDF

75.8 KB Created: 2021-04-01 01:33:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: ff4a288f1678a48afea73b9c28c430e9 SHA-1: 9db3cc3b5a24d93c80eb2a8777872419fa7bc3b0 SHA-256: a38c604c3bde9cd73395ef43a5aadfb6e81a9a14ba0d03131991329bc77f51d2
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 0.9999

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://leonvi.ru/strik?utm_term=private+practice+cast+season+4+episode+2 PDF link annotation
    • https://cdn.sqhk.co/xolovagi/3Qqheif/75709236040.pdfIn PDF document text
    • https://fazodokivev.weebly.com/uploads/1/3/4/0/134018208/wamukuxivapej_sevorogumim_gasupis.pdfIn PDF document text
    • https://gixisisopovi.weebly.com/uploads/1/3/4/7/134713576/xisunanotivis-kokekul.pdfIn PDF document text
    • https://cdn.sqhk.co/kinanekoxo/ljicOia/fevepukukofetozozig.pdfIn PDF document text
    • https://cdn.sqhk.co/delotijuw/5XdIgj4/6008631988.pdfIn PDF document text
    • https://cdn.sqhk.co/pofoxubo/dgeBhg2/40406718996.pdfIn PDF document text
    • https://cdn.sqhk.co/wazewiput/ahbfhe4/ninja_flip_oven_recipes.pdfIn PDF document text
    • https://cdn.sqhk.co/bisadumiza/R2WMjvn/science_lab_clipart.pdfIn PDF document text
    • https://xevejepagog.weebly.com/uploads/1/3/4/6/134688444/9a050b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://d4078116-a2d5-466f-97e6-20d899f6ca30.filesusr.com/ugd/576447_7b261a94ea6646ac8d16f648f212b523.pdf?index=trueIn PDF document text
    • https://0bef8565-087b-457a-960c-b0529baba50c.filesusr.com/ugd/638000_4763f65af7a24f02aea0a671db030156.pdf?index=trueIn PDF document text
    • https://e60c805d-b9e1-47fc-b045-983511e9ac1f.filesusr.com/ugd/116bb2_352db5d236194fed9a9375238c041a0b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/87b29ba0-1cf0-4c6c-9876-e12ddc6a9085/mexuro.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f63ff6bd-3270-4d9b-823f-9ac2f7ef02d7/kakurazotezusulobuzalabij.pdfIn PDF document text
    • https://cee4c475-053c-4dec-97e8-987d41263e46.filesusr.com/ugd/8c25c6_98dbb8b50be2485d8e4734cac828141e.pdf?index=trueIn PDF document text
    • https://60ceb029-6f78-4d42-8ea4-15ca08d8077a.filesusr.com/ugd/857e61_a03d8ababb554d60998fd19720840c50.pdf?index=trueIn PDF document text
    • https://6f2fb29c-15f2-4b08-b525-3eb91a7f0a41.filesusr.com/ugd/c3548c_6b545738f7304591bf77d1f97626f578.pdf?index=trueIn 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_off0000e8b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8B7 5316 bytes
SHA-256: c4be0f1fad73b58716514ffa12be0c1b231ef0efd0735497a2a981f8d94713b3
font_01_sfnt_off0000faeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAEB 10992 bytes
SHA-256: f8d3322ed2be1e153dcf1475b96859f0017567cb6e11d8b7861a03dd4f19024a

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