Malicious PDF — malware analysis report

Static analysis result for SHA-256 d35af53b4888b2ba…

MALICIOUS

PDF

86.6 KB Created: 2021-03-05 12:15:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: c9497d46bdd2ed8b6769cb13bebd297a SHA-1: cb2f154549921a8d2013b0bf3934b6da59b788e7 SHA-256: d35af53b4888b2ba74af0488277e30638251d0ac1b6a762520c411ba422af13c
126 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous external URIs, many hosted on disposable domains, suggesting a link farm or phishing lure. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and a date, indicating it was likely generated programmatically to obscure its true purpose. The presence of external URLs points towards an attempt to redirect users to malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://resalured.ru/123?utm_term=what+is+a+material+in+science PDF link annotation
    • http://uscovidcharts.com/intro_to_algebra_worksheetsbh6ve.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485572/normal_602234e8029eb.pdfIn PDF document text
    • http://sodalabs.club/what_are_the_creatures_in_the_descent_movieahanv.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384468/normal_5fe4ef713576d.pdfIn PDF document text
    • http://zhenskiizhurnal.ru/73136314828ifo8b.pdfIn PDF document text
    • http://hotloveme.online/d_d_animal_companion_sheettv5w9.pdfIn PDF document text
    • http://sixesijilolun.mywebcommunity.org/six_easy_pieces.pdfIn PDF document text
    • http://openplafond.xyz/37717147470i7km1.pdfIn PDF document text
    • http://instahelpforbusiness.com/38529913172ni85h.pdfIn PDF document text
    • https://padudarudiloga.weebly.com/uploads/1/3/4/7/134714427/vunekakomef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453575/normal_602c44bfdbcea.pdfIn PDF document text
    • http://tipofeliluget.medianewsonline.com/final_fantasy_7_remake_guide_book.pdfIn PDF document text
    • http://kersita.fun/febudurijunogazaxagazk0jlc.pdfIn PDF document text
    • https://lazumuron.weebly.com/uploads/1/3/4/8/134863931/1cffb699bc71244.pdfIn PDF document text
    • http://tesugujinarijag.mywebcommunity.org/79853182919.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://doriponesarom.myartsonline.com/html_css_javascript_php_mysql_book.pdfIn PDF document text
    • https://4b4ea461-5266-411b-8735-d5290551f550.filesusr.com/ugd/7fedcf_d66a5996cde64f558ff8447769475935.pdf?index=trueIn PDF document text
    • https://2386e270-bd20-42c1-b3e5-1ba7eaa1d68d.filesusr.com/ugd/b4f0c6_bf13b35ee9974cfba115eeca56fad649.pdf?index=trueIn PDF document text
    • https://c827806f-f9bf-4fd3-a4ce-e487c020fa79.filesusr.com/ugd/6fd45c_506689dc4eb543b78c279567600f910e.pdf?index=trueIn PDF document text
    • http://pasifowon.atwebpages.com/64667775991.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001045a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1045A 4732 bytes
SHA-256: f00218068e0754a705bd15a36d2107f6023e795173b1bf8a04b7562ad6ee429b
font_01_sfnt_off00011432.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11432 13708 bytes
SHA-256: 3bb0aad85fa63a2d7ac86e907b13888e59c7c376358128041820d65a4d7c7714
font_02_sfnt_off00013ef1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EF1 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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