Malicious PDF — malware analysis report

Static analysis result for SHA-256 04c40cd48b988de2…

MALICIOUS

PDF

78.3 KB Created: 2021-01-10 11:13:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 16b3dca52939e71f1ecbf59adc44a78d SHA-1: b4531c8bcf82c5b920d984a71fbecfe188479464 SHA-256: 04c40cd48b988de264bd1de1c6cde3c8d6b72f796b53b7a845e017ce1683bf49
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by a ClamAV signature and an ML classifier. It contains a large number of external links, many of which point to disposable domains or are used in a link farm configuration, suggesting a potential SEO manipulation or phishing scheme. One notable URL is https://traffset.ru/123?utm_term=keystone+species+activity+high+school, which is likely part of the lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://traffset.ru/123?utm_term=keystone+species+activity+high+school PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4411220/normal_5fb8422d20739.pdfIn PDF document text
    • https://butegipabozu.weebly.com/uploads/1/3/4/2/134235803/a438946.pdfIn PDF document text
    • https://site-1215266.mozfiles.com/files/1215266/rolinit.pdfIn PDF document text
    • https://powizosiki.weebly.com/uploads/1/3/4/0/134041047/861343.pdfIn PDF document text
    • https://palidabelegofa.weebly.com/uploads/1/3/4/3/134316445/c49928e25.pdfIn PDF document text
    • https://dutitujazekap.weebly.com/uploads/1/3/0/8/130814390/govorikepudago-gixidawele-wawep-xoxebilepadevu.pdfIn PDF document text
    • https://fakanodadix.weebly.com/uploads/1/3/4/3/134371587/386ad4def1f5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481695/normal_5ff3bb263243f.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/bufexa/loctite_5510_datasheet.pdfIn PDF document text
    • https://s3.amazonaws.com/xeropizuwe/aviary_photo_editor_cracked_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/wikurixobelu/fukitaxilatodafiturowotob.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_off0000f839.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF839 5228 bytes
SHA-256: 6f9491f818cb61a9e5ed7463d03d35e2ff8b45b94c413cc240d2adb974574f56
font_01_sfnt_off00010a21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A21 10080 bytes
SHA-256: cafa0551b7e4ec8915079c84b9646be5355a8c4e931dbcaac3017a2290d684c4

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