Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a4ceff7f1165ec0…

MALICIOUS

PDF

77.9 KB Created: 2021-04-27 15:52:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: c206922e22f020b150022bd60cb4765a SHA-1: 55e798212d9e03dec13b8687da7a182c83100b31 SHA-256: 1a4ceff7f1165ec0d004aae6c600bb01311e0c9b8a45f0b2ea66e7932d2a6f25
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://dafemum.ru/strik?utm_term=excellent+meme+approved PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4385852/normal_606c9084adec9.pdfIn PDF document text
    • http://www19216801.site/kiluvupanbn7yj.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4371498/normal_5fdf19532183e.pdfIn PDF document text
    • http://burutevopu.iblogger.org/biocentrismo_robert_lanza.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462352/normal_60507e358b120.pdfIn PDF document text
    • http://runmasten.online/42054520517mnr4o.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408172/normal_5fce188f0c98c.pdfIn PDF document text
    • http://ijmalan.xyz/walter_piston_harmony_book1ne4n.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492574/normal_6066d64a9da61.pdfIn PDF document text
    • http://rivozuzeno.mywebcommunity.org/lakosi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mifotabelimudon.myartsonline.com/how_to_describe_a_fallen_tree.pdfIn PDF document text
    • https://s3.amazonaws.com/kukazowox/sea_of_thieves_mac.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ea280844-7a5d-4400-8062-fc4ef818acf4/kusex.pdfIn PDF document text
    • https://s3.amazonaws.com/niporofez/vukokafagevutobasevi.pdfIn PDF document text
    • http://lasiratiguguro.rf.gd/wild_animals_and_their_babies_names_in_english.pdfIn PDF document text
    • http://tezafuxiwod.rf.gd/architectural_abbreviations_nts.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d24998d1-d058-4393-85f1-66e904f3f6fb/36357214266.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/08e0db1b-fb25-4717-9315-5f443b2b7ff8/tafogesijinexewararera.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_off0000f68c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF68C 5124 bytes
SHA-256: 30dde042ec06af197da49eba71926e8ff8562fe2a25bd3207e2ea0266fab5089
font_01_sfnt_off000107ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107ED 10152 bytes
SHA-256: eb18069a2544c0b99ef2adfd606afb2111faa4d861512d1b306b7e88424437ad

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