Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8778f213a124bb8…

MALICIOUS

PDF

66.4 KB Created: 2021-01-17 02:50:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 0d455787b283be52d3d7acda328caee7 SHA-1: 6df5e36b12a99dada5b1cbd164f7b6db480420d6 SHA-256: e8778f213a124bb8012ed3a713197ad4183fabc27b0c92d335330f4ef0c511b3
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The sample was identified as malicious by ClamAV and an ML classifier, with heuristics indicating it contains a large number of external links, characteristic of a link farm or phishing lure. The embedded URLs point to various PDF files hosted on external domains, suggesting a multi-stage redirection or content delivery mechanism. The document body appears to be obfuscated or corrupted, but the presence of URLs and the heuristic firings strongly suggest an intent to redirect the user to malicious content.

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 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.
  • 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://traffnew.ru/123?utm_term=papa+a+toda+madre+capitulo+57 PDF link annotation
    • https://cdn.sqhk.co/nowovadizeb/MY0Awif/xfinity_series_race_schedule_2018.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378620/normal_5f8dfa58835c5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412154/normal_5fa96db2b9289.pdfIn PDF document text
    • https://cdn.sqhk.co/kixagixupo/gIjbWgj/reminudorekofajesujutowin.pdfIn PDF document text
    • https://cdn.sqhk.co/nedupugifuka/fkCjfhj/red_white_and_blue_jordan_1_high.pdfIn PDF document text
    • https://cdn.sqhk.co/fidisutipamu/GialvOp/76917358241.pdfIn PDF document text
    • https://cdn.sqhk.co/wirowanorax/gjjfPXq/club_dream_league_soccer.pdfIn PDF document text
    • https://cdn.sqhk.co/jemajujo/6jagdhj/field_hockey_training_videos.pdfIn PDF document text
    • https://gabejopow.weebly.com/uploads/1/3/4/5/134597712/c2c634ee6b7641.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482872/normal_5ff546be6009f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409243/normal_5f9a242f77827.pdfIn PDF document text
    • https://ditiwudo.weebly.com/uploads/1/3/1/4/131452947/ruvewa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410731/normal_5fcab773eb366.pdfIn PDF document text
    • https://cdn.sqhk.co/vumajotiwog/VEgihbv/84564601483.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414352/normal_5fcbf6b13e7f0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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

Related samples 6

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c585.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC585 5244 bytes
SHA-256: 0e181f8666a9a724e36b6d19dc94aa254df3e69cefaa3dcdf9b75f2ed5d5e564
font_01_sfnt_off0000d74f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD74F 11244 bytes
SHA-256: e84174f707fae2bcd6210fc77767af1f44b03588c67a264fb7ffdcb1ec05a292

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