Malicious PDF — malware analysis report

Static analysis result for SHA-256 16e6e6c2af703805…

MALICIOUS

PDF

79.5 KB Created: 2021-04-08 16:53:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 90b8c50025af7ad41da2e208ac07c35e SHA-1: 30655d7ddaecec613c9cbfe8aed673c080a41a62 SHA-256: 16e6e6c2af7038056b100fee28fb664a1695ff2c7da859281f606113078edd4c
146 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many hosted on disposable domains, and is flagged by ML classifiers and ClamAV as malicious phishing content. The document body, though heavily obfuscated, appears to be a lure related to search queries, directing users to potentially malicious sites. The presence of external URIs and link farm characteristics strongly suggests a phishing or malware distribution attempt.

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 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://pelibifir.ru/strik?utm_term=how+much+do+geotechnical+engineers+make PDF link annotation
    • http://sekizabugurewud.iblogger.org/67431188772.pdfIn PDF document text
    • https://cdn.sqhk.co/mivadunoxo/O0mjjid/lirataj.pdfIn PDF document text
    • https://cdn.sqhk.co/pujixefan/w2EhfSZ/22213227839.pdfIn PDF document text
    • http://rezotu.xyz/blank_board_serializer_big_surci3uv.pdfIn PDF document text
    • http://debesokad.22web.org/agnes_monica_cinta_tak_ada_logika.pdfIn PDF document text
    • https://cdn.sqhk.co/ferobisuw/hizvieA/87896732567.pdfIn PDF document text
    • https://cdn.sqhk.co/remezebona/hjnahbA/conquest_tsi_for_sale_craigslist.pdfIn PDF document text
    • https://cdn.sqhk.co/pefisemise/ieiafjd/winuruvezulabadokaxamira.pdfIn PDF document text
    • https://cdn.sqhk.co/vuvupewog/gtjghji/hillsong_praise_worship_playlist_songs_2019_download.pdfIn PDF document text
    • http://fagutoje.22web.org/zewusadutejisiputis.pdfIn PDF document text
    • https://cdn.sqhk.co/xenivoronizu/dWJiajj/dual_citizenship_germany_usa_benefits.pdfIn PDF document text
    • https://cdn.sqhk.co/jifigetuxu/dcBiOY8/jokawesedifimetupesefa.pdfIn PDF document text
    • http://meetraisins.club/aviso_de_privacidad_formator88p5.pdfIn PDF document text
    • https://cdn.sqhk.co/desiruzag/csdKijf/jazatepapivo.pdfIn PDF document text
    • http://gifozazupu.iblogger.org/muxuwa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gamupuzif.epizy.com/boruto_wiki_episode_guide.pdfIn PDF document text
    • http://tadufaz.rf.gd/10818729688.pdfIn PDF document text
    • http://nabasuxogakuwet.epizy.com/pilelanisupegomis.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_off0000f68d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF68D 5468 bytes
SHA-256: 1834bd1493112257a6c9ba3642fe141fae18a93756d80f8b34d02af872d61e46
font_01_sfnt_off00010908.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10908 11660 bytes
SHA-256: 58a4bb175b9e3db66e84c0e3d5cf4d5751978480c745c6e33c55060edce58269

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