Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b70541240606863…

MALICIOUS

PDF

84.2 KB Created: 2021-03-02 17:30:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 34fd99782f80074c0e5e07f840d32e6e SHA-1: f2e10b93a88dd0af1fe1e969ce154431f8678455 SHA-256: 8b70541240606863210e6ffab5d323a5a1de1a53f83eb252bc6149d9156223f2
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier. It contains embedded URLs pointing to suspicious domains, including one that appears to be a link farm. The document body, though heavily obfuscated, suggests a lure related to 'Asp.net interview questions and answers'. The presence of external URIs and the overall structure indicate a phishing or malicious content delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://soxebez.ru/award?keyword=asp.net+interview+questions+and+answers PDF link annotation
    • http://eushopvmn.site/fuwigigijuxomadb85t.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485926/normal_60149044bc44c.pdfIn PDF document text
    • https://latenenagizogip.weebly.com/uploads/1/3/2/6/132696064/banusukurulavam.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385863/normal_601ca6ef3e2e2.pdfIn PDF document text
    • https://cdn.sqhk.co/vinogusi/hggrbpX/39273471827.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455898/normal_5ff2ba4418e4c.pdfIn PDF document text
    • https://nerolokem.weebly.com/uploads/1/3/5/3/135326062/5456649.pdfIn PDF document text
    • https://cdn.sqhk.co/rubupidorinu/fidUNBo/nirixuxuponaz.pdfIn PDF document text
    • http://trynon.xyz/lista_de_cualidades_positivas_y_negativasr8vql.pdfIn PDF document text
    • http://beliyden.xyz/69380371749e17n7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487208/normal_6009313261593.pdfIn PDF document text
    • http://lovelid.xyz/9626415870he3e4.pdfIn PDF document text
    • http://birjand.design/body_building_motivation_videos_free9y4qj.pdfIn PDF document text
    • https://voxonevixes.weebly.com/uploads/1/3/4/3/134383310/duzixabonanor.pdfIn PDF document text
    • https://sulomotosepotu.weebly.com/uploads/1/3/4/7/134744650/8047b111acde.pdfIn PDF document text
    • https://joxefumisati.weebly.com/uploads/1/3/1/4/131406837/datitotuneloxu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/nuruvapozixix/jack_lalanne_power_juicer_lifetime_warranty.pdfIn PDF document text
    • https://s3.amazonaws.com/laginekux/ryobi_battery_charger.pdfIn PDF document text
    • https://s3.amazonaws.com/mikibetiv/93074502870.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_off00010e58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E58 5220 bytes
SHA-256: 0c35930ef29f8b45bfd5263623570440a7e722ff4373978680789671c574d9c4
font_01_sfnt_off00012041.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12041 10240 bytes
SHA-256: 8919f0bef344ea38b6e449c8c6d1280f8574ed1fc29f38f67e3d0a53f8b3f2e0

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