Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6502bb0059b45aa…

MALICIOUS

PDF

68.7 KB Created: 2021-01-04 02:02:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: b436c036c58fb985bf9ad3c1955a5d09 SHA-1: e5520fe2fdff1e661c4f9ee404973bb5485621ec SHA-256: f6502bb0059b45aa5c689ff124627f07c852aa427ca0210971db9faf5fdebcdf
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious sites. The embedded URL 'https://traffset.ru/aws?utm_term=information+systems+support+salary' further supports the phishing pretext of providing salary information. No scripts were extracted, but the PDF structure itself is used to host and distribute these malicious links.

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/aws?utm_term=information+systems+support+salary PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4485572/normal_5fafbf53ba684.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376380/normal_5fe8268f4a651.pdfIn PDF document text
    • https://xipunozelizu.weebly.com/uploads/1/3/1/3/131382486/ratade.pdfIn PDF document text
    • https://papunagaku.weebly.com/uploads/1/3/1/3/131384156/koloro.pdfIn PDF document text
    • https://wulenewovifof.weebly.com/uploads/1/3/4/5/134588468/cfd3c0564b070.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365607/normal_5fa5f71f00595.pdfIn PDF document text
    • https://mijisurux.weebly.com/uploads/1/3/1/0/131070147/41482.pdfIn PDF document text
    • https://bijawodit.weebly.com/uploads/1/3/4/8/134883407/wekenegemesum.pdfIn PDF document text
    • https://daxigowopijadek.weebly.com/uploads/1/3/0/8/130814785/4ba0537c.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/xixonu/betuxerewoviwabomemeves.pdfIn PDF document text
    • https://s3.amazonaws.com/gupojakami/chameli_movie_video_songs_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d989f133-6618-4c15-b921-5d2b461abfa2/jabuj.pdfIn PDF document text
    • https://s3.amazonaws.com/welutizenop/voripudunok.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_off0000cf70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF70 5088 bytes
SHA-256: 633fd1104197488c872979a5d7ce9edd8cb8ee05555eebaf32ce64f643078dbc
font_01_sfnt_off0000e0af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0AF 10968 bytes
SHA-256: c33822fd2977348d20caced9fb10e6a227602b0275dcc65e31340888728a6a69

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