Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b9f946910f41844…

MALICIOUS

PDF

79.2 KB Created: 2021-02-21 06:15:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 8fd816073aefcdf0cbdec048829b04c4 SHA-1: 99067148e34ce21c0a3634c70888c1553b802f17 SHA-256: 6b9f946910f41844fce0c298bbe9afb43a8b4c8ef1e2959fe7b1cd1461b8d5e6
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, many hosted on disposable domains, suggesting it's part of a link farm designed to drive traffic to potentially malicious sites. The document body, though heavily obfuscated, contains metadata related to 'exercises for seniors' and the wkhtmltopdf tool, which is likely a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jottigo.ru/aws?utm_term=has+exercises+for+seniors PDF link annotation
    • https://cdn.sqhk.co/pidagasew/hggf0gi/luworekok.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369653/normal_6014b9d7888ed.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393033/normal_6023e6a28f228.pdfIn PDF document text
    • https://pavadugubuwab.weebly.com/uploads/1/3/4/3/134309483/ganatumaker-vogorelisu.pdfIn PDF document text
    • https://cdn.sqhk.co/lajoroteb/93oWEHN/69577036971.pdfIn PDF document text
    • https://cdn.sqhk.co/midijanere/dg6Euq0/99126186394.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4529149/normal_5fc8088b958f2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4463543/normal_5fdf519925a5c.pdfIn PDF document text
    • https://cdn.sqhk.co/zaviresodew/txtjgjx/crossfire_game_download_for_pc.pdfIn PDF document text
    • https://zawoxabupuw.weebly.com/uploads/1/3/5/9/135990747/nokazatobozepafam.pdfIn PDF document text
    • https://putonikasobex.weebly.com/uploads/1/3/1/0/131070178/gibesozapev.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4406820/normal_60001c6abdf5a.pdfIn PDF document text
    • https://cdn.sqhk.co/tirekidifole/chiBf39/my_piano_phone_windows.pdfIn PDF document text
    • https://bogilerilixami.weebly.com/uploads/1/3/5/3/135345361/4528659.pdfIn PDF document text
    • https://wironutoti.weebly.com/uploads/1/3/0/7/130739747/jularurefudezegoleja.pdfIn PDF document text
    • https://cdn.sqhk.co/bunigenozav/BjfNkhc/55035375865.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385217/normal_601bbc0e6a5d9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465538/normal_5ff8bcab8b999.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/gekixadonuru/72911140699.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_off0000fb8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB8F 4872 bytes
SHA-256: 55e04e141a7097416b5b6ef6d2ea1696f3e7bdda173c8a4b18e3d4a4a2e0038e
font_01_sfnt_off00010c31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C31 10268 bytes
SHA-256: 2af3dcf0eed436aef4cc700684d27a561b80dd3d3240e5b0b1ab9c6e375faf49

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