Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a29fc9c1acb5209…

MALICIOUS

PDF

114.8 KB Created: 2021-03-02 13:30:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 6d66bdf9a1f3e1e27baf4303f6f5aa4e SHA-1: e1f7fd5828bb46b53200972e92cacbacaa7f5106 SHA-256: 9a29fc9c1acb5209055d0be102fb1e76ce15873aff7880a2facff4fff76c3c30
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are SEO-optimized and point to potentially malicious domains, as indicated by the 'PDF_SEO_LINK_FARM' heuristic. The document body, though heavily obfuscated, contains keywords related to COVID-19, suggesting a lure. ClamAV and ML classifiers also flagged this PDF as malicious, likely due to its link farm and phishing characteristics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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.
  • 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://druttle.ru/strik?utm_term=best+protocol+for+covid+19 PDF link annotation
    • http://nasporte1.fun/diabetes_food_guidelines6aw12.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454420/normal_5fce7b82abb36.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479902/normal_5ff37406e1974.pdfIn PDF document text
    • http://kernig.store/craftsman_self_propelled_lawn_mower_electric_start_batterykegwf.pdfIn PDF document text
    • http://vevaxogejaz.scienceontheweb.net/kx_85_price_malaysia.pdfIn PDF document text
    • https://xujopikaxatanow.weebly.com/uploads/1/3/4/8/134850499/namokirilunifa-nilupevuderubo-toguvul-nugap.pdfIn PDF document text
    • https://gazumewus.weebly.com/uploads/1/3/4/9/134901575/1912806.pdfIn PDF document text
    • http://rawoxaxevog.mygamesonline.org/celine_dion_ne_me_quitte_pas_lyrics_translation.pdfIn PDF document text
    • http://4kuhd.me/85542296907ydj32.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4505102/normal_601b51a73ac33.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4502439/normal_5fe0d57c9bd4e.pdfIn PDF document text
    • http://bitcoinov.site/bedigatciujd.pdfIn PDF document text
    • http://shoop-fm.ru/laws_of_the_game_soccer_test49wcr.pdfIn PDF document text
    • http://cabinetshub.xyz/harry_potter_book_collectionzrsnp.pdfIn PDF document text
    • http://pawezujexas.mywebcommunity.org/33962855064.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411921/normal_5ffdeeb23b5ec.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413109/normal_5fcc930c5ad95.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407780/normal_5ffc685dc3e3c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vekejuf.atwebpages.com/boverower.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_off0001835d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1835D 5256 bytes
SHA-256: 533546d286c000a3d633dcac767d7a69b8d78b07cb09b2a736db99980827cb7c
font_01_sfnt_off00019561.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19561 12664 bytes
SHA-256: 5eb093f9c71b7f59bca26d85e3e9388ec647f6cea97f8f20be4768eeaeac5627

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