Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a24322eff304d7d…

MALICIOUS

PDF

81.0 KB Created: 2021-06-02 21:59:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: e60d6f5a43714481b71ec1300d6e35ec SHA-1: eb9180ecbe82dae553991f88b05febc11767d5d6 SHA-256: 3a24322eff304d7d28d7403ab7dce9188f8c12c700ba86764fc69f87911eeb39
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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 0.9996

Heuristics 6

  • 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 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://crysiq.ru/pbw?utm_term=what+should+a+pitta+kapha+eat PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4471682/normal_6005d7009f444.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455406/normal_5fe6d8b7f0071.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393189/normal_606e30bf326c0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485822/normal_5fe313ebe2a74.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421783/normal_600ca84eb492f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420438/normal_6017d9b09aebb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469143/normal_5fc5bd3f81d36.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409619/normal_604d90282e0a5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417818/normal_6057d08def373.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391327/normal_5fc611470d187.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391921/normal_5fffc6f474fae.pdfIn PDF document text
    • https://daliroxemonove.weebly.com/uploads/1/3/0/7/130775241/ae1178f25a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412174/normal_606e3781660c8.pdfIn PDF document text
    • https://golamusexa.weebly.com/uploads/1/3/1/6/131606818/sezamukoges.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sijomirurefi.pbworks.com/f/86183297022.pdfIn PDF document text
    • http://xiwitanul.pbworks.com/f/nike_brand_guide.pdfIn PDF document text
    • http://palixazoke.pbworks.com/w/file/fetch/144427695/wozujepiduvumup.pdfIn PDF document text
    • http://jifesepapo.pbworks.com/f/boruto_vs_momoshiki_full_movie_sub_indo_facebook.pdfIn PDF document text
    • http://jifesepapo.pbworks.com/f/pamijer.pdfIn PDF document text
    • http://jesababa.pbworks.com/f/8452973521.pdfIn PDF document text
    • http://zepadatoju.pbworks.com/w/file/fetch/144428358/download_alcoro_em_portugues.pdfIn PDF document text
    • http://mikabipi.pbworks.com/w/file/fetch/144433644/63512786564.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_off00010186.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10186 5028 bytes
SHA-256: 95d0e221f73428a7a1e5b14cb2c3d424c7328270c850937b692cc0190d620384
font_01_sfnt_off000112aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112AA 10796 bytes
SHA-256: 457e698211bdeb0d3cfb02e9b83d480776cdf302efd81f0902847d0676d1a1a6

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