Malicious PDF — malware analysis report

Static analysis result for SHA-256 90b3e8495c1a63ec…

MALICIOUS

PDF

72.5 KB Created: 2021-06-04 23:48:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: b16f03fc95e441fee263f4f1fc326e9a SHA-1: d6ce4e81ce384ba8a88ecd8f962ac42b52d01054 SHA-256: 90b3e8495c1a63ec8bfa08fe6b50cce0fbdbd7dc717445d50dc397474acb946e
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file is identified as malicious by multiple heuristics and an ML classifier, and is detected by ClamAV as a phishing trojan. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic to direct users to potentially malicious sites. The document body text is heavily obfuscated and appears to be junk data, but the presence of external URIs and the overall structure strongly indicate a phishing or malicious redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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.
  • 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://irlanc.ru/pbw?utm_term=yardworks+lawn+mower+repair+center PDF link annotation
    • https://xumiwuwazugeri.weebly.com/uploads/1/3/4/4/134444831/zadupafu.pdfIn PDF document text
    • https://meronikam.weebly.com/uploads/1/3/4/7/134705372/1894171.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476135/normal_6056782fd32e3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446650/normal_6038d43738108.pdfIn PDF document text
    • https://lanowixel.weebly.com/uploads/1/3/4/8/134862970/1ee379787bcdd.pdfIn PDF document text
    • https://zimuvudiredefux.weebly.com/uploads/1/3/2/7/132710782/1ce0198c23fc.pdfIn PDF document text
    • https://pezilesuwubev.weebly.com/uploads/1/3/4/6/134639222/6278969.pdfIn PDF document text
    • https://zisugopijelides.weebly.com/uploads/1/3/1/4/131438068/8fee4af69928dce.pdfIn PDF document text
    • https://fojigexo.weebly.com/uploads/1/3/4/2/134235048/9293211.pdfIn PDF document text
    • https://nupinowag.weebly.com/uploads/1/3/0/8/130814423/5c0e80284b0.pdfIn PDF document text
    • https://xuvuvigaxopezut.weebly.com/uploads/1/3/4/7/134721928/tikejimovaje.pdfIn PDF document text
    • https://neruzokari.weebly.com/uploads/1/3/1/1/131164447/acc6bd.pdfIn PDF document text
    • https://girosiwubu.weebly.com/uploads/1/3/0/7/130740458/tomuzowuwu_kirasaxudab_pegagodipasa.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/859c9ba9-6249-49bc-b46d-a6f000ab5c94/mirro_pressure_cooker_recipes_corned_beef.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6ddb2b4e-44b3-426b-bf4e-2c9e5bdb2283/prensa_manual_tijolo_ecologico_sahara_preo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f99a00c6-367f-4518-9e73-3949c761e510/boy_scouts_tree_sale_near_me.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/05cf2bda-f5fd-4684-9b5d-9745232e4a17/grimoire_of_tiamat.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bae4ba6c-5788-40b3-b0d6-0e51dc45e8d9/ariel_sylvia_plath_book_depository.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_off0000df56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF56 5336 bytes
SHA-256: c9d3da00075a0af899148c2f1dd054243b09c76496c995cc838f1de2ba3baeea
font_01_sfnt_off0000f17b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF17B 10332 bytes
SHA-256: e6be35e93494b22c4921bb91c50a2e590083f1cefbf6ed032093d682369315f0

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