Malicious PDF — malware analysis report

Static analysis result for SHA-256 d164ebf77cbe8cfa…

MALICIOUS

PDF

76.0 KB Created: 2021-02-28 00:04:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 4f10a064d0db090693234b087c92c78f SHA-1: a23d61660d9d117264113176762f73e9424f02a8 SHA-256: d164ebf77cbe8cfad73c30395ddbbe8f040567c217f8a009a9a74c140c1d8ba2
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-like behavior. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or redirection scheme. The embedded content, though heavily obfuscated, appears to be related to search engine optimization and potentially malicious redirection.

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/strik?utm_term=what+kind+of+bread+can+you+eat+on+low+fodmap+diet PDF link annotation
    • https://dofusugizubev.weebly.com/uploads/1/3/4/1/134108946/c146775f5c4c6.pdfIn PDF document text
    • http://romigeguwapefi.22web.org/foraguketikigubujumuti.pdfIn PDF document text
    • https://pawizujepus.weebly.com/uploads/1/3/1/6/131637171/e4277d97d.pdfIn PDF document text
    • https://cdn.sqhk.co/veludewozen/licjjQU/m134_minigun_gif.pdfIn PDF document text
    • https://cdn.sqhk.co/bavimimo/mUCjd4B/3939222600.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484363/normal_6018e8221a849.pdfIn PDF document text
    • https://cdn.sqhk.co/tajixixejafi/aA9ieid/loopback_audio_mac_review.pdfIn PDF document text
    • https://joninotabuxid.weebly.com/uploads/1/3/5/3/135387421/11e66e9ddecb8.pdfIn PDF document text
    • https://finazevad.weebly.com/uploads/1/3/0/7/130739247/cdb57284cc14956.pdfIn PDF document text
    • https://jazujopu.weebly.com/uploads/1/3/0/8/130873842/lopeviwomukurukukej.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445754/normal_600b70bfac9e6.pdfIn PDF document text
    • https://cdn.sqhk.co/latipizi/SHgMUR8/sling_tv_14_day_free_trial_roku.pdfIn PDF document text
    • https://medotufise.weebly.com/uploads/1/3/4/5/134512565/9405930.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xivajaraseb.rf.gd/6110833371.pdfIn PDF document text
    • http://lugukejuraxa.rf.gd/97250455333.pdfIn PDF document text
    • http://fidawakuxut.epizy.com/nilule.pdfIn PDF document text
    • http://pexoroxijaseduj.rf.gd/factual_report_text_singkat.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_off0000eaaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAAA 5628 bytes
SHA-256: 07af4110800f8111c6caa0ed9641b76decf9f21b346ce3e7e82cad983238234f
font_01_sfnt_off0000fdc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDC0 10800 bytes
SHA-256: 4b09707fe5e6ed694e237d52bebb5602c692616aa521143f5892d951d346c838

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