Malicious PDF — malware analysis report

Static analysis result for SHA-256 41702fa394e932da…

MALICIOUS

PDF

93.6 KB Created: 2021-03-14 21:29:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 51bb6950d7dd54d1c1704ba9133cea9b SHA-1: a9db033bdac0e32d0e4a61c76acf177fdcb7b59d SHA-256: 41702fa394e932dab574d6c02bce29e141a6e5cf638664712f180bf3e1c010aa
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting and exhibiting link farm characteristics, strongly suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection confirm its malicious nature. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious intent, likely to redirect users to malicious sites.

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 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://jumiwimov.ru/strik?utm_term=what+is+the+main+idea+of+the+adventures+of+tom+sawyer PDF link annotation
    • http://rusherx.studio/cbt_worksheets_for_teenage_social_anxietytegyz.pdfIn PDF document text
    • https://cdn.sqhk.co/belesobikezi/1gfcGv0/whatsapp_update_latest_version.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446380/normal_601eedf47423b.pdfIn PDF document text
    • http://vwwv-avito.online/5024044396175aru.pdfIn PDF document text
    • https://cdn.sqhk.co/niririga/fijbd9I/vuredemu.pdfIn PDF document text
    • https://cdn.sqhk.co/dubutemaruxu/OgfFijZ/95845411732.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455195/normal_60144836b027a.pdfIn PDF document text
    • http://vedibekupuviru.iblogger.org/turiberewaxamakubet.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380528/normal_604aa082bc946.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374211/normal_60315ea6d873b.pdfIn PDF document text
    • https://cdn.sqhk.co/supopareso/jdwTzjd/bisulezagutosa.pdfIn PDF document text
    • https://cdn.sqhk.co/jigavozef/gchhTe1/62566372329.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/d50c3b67-1742-443a-acee-9606403f339e/64680771287.pdfIn PDF document text
    • http://voveganodamamuf.rf.gd/54747694140.pdfIn PDF document text
    • https://s3.amazonaws.com/fojaxexino/bariponobesu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4764d5ba-24cb-46d8-8ff2-45470a6158ac/panasonic_dect_kx-tgc210fxb.pdfIn PDF document text
    • http://ribezewipuzez.epizy.com/45943911749.pdfIn PDF document text
    • https://s3.amazonaws.com/bajapovogam/fidip.pdfIn PDF document text
    • https://s3.amazonaws.com/doxifuba/17902259096.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/78fb61fb-d00f-407d-90a7-b015524537eb/what_is_the_best_diet_to_lose_weight_without_exercise.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_off00012a5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A5D 5384 bytes
SHA-256: 57e683b66bf8d889f284bc1f1f663292d3f23e00da705d2ac2ae8d3e0e6488d8
font_01_sfnt_off00013c9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C9D 14088 bytes
SHA-256: ca3758f928f266ffefb34ebbfb406b16e1e591937c7a42a48c125d2f12c3c5ce

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