Malicious PDF — malware analysis report

Static analysis result for SHA-256 0af1c408a7c573e1…

MALICIOUS

PDF

109.1 KB Created: 2021-03-22 01:12:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0861c3efb2ee46bd60bb4ab386ec29f5 SHA-1: 2ba0378f537cfff28f7377185032ffb838f304a7 SHA-256: 0af1c408a7c573e1b81e0397ba89cd2d939495ad490ac2fd44b5c293a7aa82c7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external links, indicating a link farm or phishing attempt, as suggested by the 'PDF_SEO_LINK_FARM' heuristic. ClamAV detection and ML classification confirm its malicious nature, likely as a phishing or trojan distribution vector. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pelibifir.ru/123?utm_term=pile+load+test+report+pdf
    • https://static.s123-cdn-static.com/uploads/4422637/normal_5fdeabbf9fd82.pdf
    • https://rikidunojig.weebly.com/uploads/1/3/4/4/134488605/befubebip.pdf
    • http://lugabev.mygamesonline.org/peg_perego_primo_viaggio_4-35_cleaning_instructions.pdf
    • https://cdn-cms.f-static.net/uploads/4489409/normal_60153dbc8a8a7.pdf
    • https://debemalimuwu.weebly.com/uploads/1/3/4/3/134385929/kegizotivafemedavidi.pdf
    • https://jamakebowixon.weebly.com/uploads/1/3/4/4/134477175/2596166.pdf
    • https://tajurasexir.weebly.com/uploads/1/3/1/6/131606020/2eefb.pdf
    • http://gusevoxuzuwelap.mywebcommunity.org/xamojalajibekipudisuzuw.pdf
    • https://cdn-cms.f-static.net/uploads/4458622/normal_601b7b04a72f2.pdf
    • https://cdn-cms.f-static.net/uploads/4423699/normal_601d76eaa5207.pdf
    • http://fukiwurezopukof.mywebcommunity.org/ugly_duckling_story_book.pdf
    • https://bitujidup.weebly.com/uploads/1/3/4/5/134598072/9403776.pdf
    • http://foxiduwanati.mygamesonline.org/conjunctions_grammar_exercises.pdf
    • https://cdn-cms.f-static.net/uploads/4393209/normal_6018372a4454a.pdf
    • https://cdn-cms.f-static.net/uploads/4484812/normal_6037dd63610ed.pdf
    • https://static.s123-cdn-static.com/uploads/4480880/normal_6002162197f8b.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://wugerubuvugox.myartsonline.com/the_culture_code_rapaille_summary.pdf
    • https://5548a280-a194-4776-8019-0e256783c1fa.filesusr.com/ugd/f2c1dc_06cc419b4f75470089ada5b38a78b666.pdf?index=true
    • https://6b52f5a6-db44-4d3e-8337-ab33c729cb13.filesusr.com/ugd/f4de5e_4cad306d5d004dfda8fa812ecd02ab42.pdf?index=true
    • https://d992f69e-bc5b-430a-92d7-abfd66d0380b.filesusr.com/ugd/6f7357_19f2435d740b4f30b93f6720188a3d18.pdf?index=true
    • https://a50dbba5-e4fd-40cc-afa9-a45495a5accf.filesusr.com/ugd/7f929b_8d3abeee93614c95bd761343377e812c.pdf?index=true
    • http://vumovofun.onlinewebshop.net/challenges_of_ecotourism.pdf
    • http://pimobepetokonud.myartsonline.com/servant_leadership_greenleaf.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00017112.bin
43be5a899049adfd690d52cb9fcb2bd810b745f6de151f29340583fc72aefd0c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x17112 5036 bytes
font_01_sfnt_off00018243.bin
eb1b48fa1e6b3a28664160eef43cd597da804034d1c2169ffb68c6bcdf8b777b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x18243 10772 bytes

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