Malicious PDF — malware analysis report

Static analysis result for SHA-256 4364b9c1d27e52bf…

MALICIOUS

PDF

71.9 KB Created: 2021-05-19 02:28:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: c5e383466f8ede54ef56d247a13f7324 SHA-1: 123895db1079c27992422e3cf81e21556d21b1cc SHA-256: 4364b9c1d27e52bf8a55a3ce84a8175742cc3a654f0f8bd34406a129b72a3e0d
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://bologen.ru/strik?utm_term=salamander+shower+pump+ct50+twin+manual PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4366382/normal_605f2a6cc15cf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409796/normal_5fec1d5bd69ae.pdfIn PDF document text
    • https://loribipusav.weebly.com/uploads/1/3/1/3/131379532/2207137.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444110/normal_604a803145792.pdfIn PDF document text
    • https://likukekubusaz.weebly.com/uploads/1/3/1/4/131408788/7953991.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415964/normal_5fed5d5a50368.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420589/normal_5fdcc277d6bfc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381104/normal_604019f4073c4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4394079/normal_6042bc25bcc49.pdfIn PDF document text
    • https://walupufodurutos.weebly.com/uploads/1/3/4/7/134734499/wugonesuboto-fitod.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374374/normal_600e6c5b87616.pdfIn PDF document text
    • https://volamajujidek.weebly.com/uploads/1/3/4/6/134667755/6664290.pdfIn PDF document text
    • https://guxofoxevi.weebly.com/uploads/1/3/4/7/134737998/bdfa22c4b3e.pdfIn PDF document text
    • http://sosunimepewe.22web.org/38409291089.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494149/normal_5fdb35fcc5998.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366978/normal_6062d9630932d.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/kudowo/81485297324.pdfIn PDF document text
    • https://s3.amazonaws.com/fukezavazuj/84833003200.pdfIn PDF document text
    • https://s3.amazonaws.com/xidulumexi/80_bpm_drum_beat_hip_hop.pdfIn PDF document text
    • http://dukodisedibuji.epizy.com/sexumixewozewapow.pdfIn PDF document text
    • https://s3.amazonaws.com/mozedijiz/ac_market_apk_cracked_free.pdfIn PDF document text
    • https://s3.amazonaws.com/biwubeleba/85491851835.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_off0000d973.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD973 5776 bytes
SHA-256: 85ffb9292740bb0af62745b01abcdecbe8b9aabf9dee025a991757539d975352
font_01_sfnt_off0000ed03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED03 10976 bytes
SHA-256: 390c2d70ae018473cb352937dc8c40444dc3e0f8f912a2116ea8ac1299b51aba

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