Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e3bd8ad395439e4…

MALICIOUS

PDF

72.1 KB Created: 2020-12-31 13:40:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 6270159876f2f7017574fa754c967042 SHA-1: b92c464aa5a1a4db87284dbe1267d02e9bf3b394 SHA-256: 6e3bd8ad395439e45ce8bc5e6372f9624574379e27550eb826a5bec0f0377cdf
196 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF was flagged by multiple heuristics as malicious, including ClamAV and an ML classifier. It contains a link farm and an SEO redirector pointing to 'https://trafffe.ru/strik?utm_term=qdialog+set+title', suggesting a phishing or malware distribution attempt. The presence of embedded URLs and the overall structure indicate it's likely part of a phishing campaign, potentially using a spearphishing attachment vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://trafffe.ru/strik?utm_term=qdialog+set+title PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4409103/normal_5fcc029ea8da7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490138/normal_5fea289d2933e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402720/normal_5fbec1396eb42.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370057/normal_5fe64e9eaf993.pdfIn PDF document text
    • https://pukelubaluwo.weebly.com/uploads/1/3/4/7/134741361/larumanenibiva.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415073/normal_5f9b2c7b78a08.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/pisedij/free_bootable_flash_drive_windows_7.pdfIn PDF document text
    • https://s3.amazonaws.com/rodigapigeta/afterburner_4._6._0_beta_10.pdfIn PDF document text
    • https://s3.amazonaws.com/pibabopuduj/dusexuratalap.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/30c3fa31-7c80-4278-a722-8cc883b5e805/download_game_angry_shark_2016_mod_apk_rexdl.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

Related samples 2

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_off0000dc9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC9D 4956 bytes
SHA-256: cc7cca0f2061a2c9e9a2d421d916c1fc4fff4236c737fb3b0dc51b44ed21ee6a
font_01_sfnt_off0000ed8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED8A 11332 bytes
SHA-256: f3b5f5499445fac6ba1fa542639f047bddcc1b400a0dba996c59a2b97d0eb020

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