Malicious PDF — malware analysis report

Static analysis result for SHA-256 73acef4e640d25a9…

MALICIOUS

PDF

69.0 KB Created: 2021-01-26 12:49:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 889c43bcae39463fea011c71f97bc207 SHA-1: 188601cbdd884a515c740a51e18618f01a9df2f9 SHA-256: 73acef4e640d25a9261b096741eaa4136b8f4e12512c8bd605c38d829ef873b8
126 Risk Score

Malware Insights

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

The PDF contains multiple external URIs and is flagged as a link farm on disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious lure designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://druttle.ru/123?utm_term=miller+syncrowave+200+manual+espa%25C3%25B1ol PDF link annotation
    • http://winnerslm.space/19108841199ijmmq.pdfIn PDF document text
    • https://cdn.sqhk.co/munuluxel/tRrgejd/callaway_preowned_putters.pdfIn PDF document text
    • http://rineset.xyz/90591288594w5hxy.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410214/normal_5ff66b97965ac.pdfIn PDF document text
    • http://jidugisukeranav.iblogger.org/video_player_for_pc_filehippo.pdfIn PDF document text
    • https://cdn.sqhk.co/menasimax/ijijjic/unicorn_runner_3d_mod_apk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453551/normal_5fc5aacb517ea.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420767/normal_600dbe2b3e08a.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/kaxukok/tilepuxin.pdfIn PDF document text
    • https://s3.amazonaws.com/nowokil/ngaji_ar_rahman_merdu.pdfIn PDF document text
    • https://s3.amazonaws.com/tigewibejageju/83945134991.pdfIn PDF document text
    • http://xijodakofifo.epizy.com/51502161429.pdfIn PDF document text
    • https://s3.amazonaws.com/widofafane/delhi_metro_route_map.pdfIn PDF document text
    • https://s3.amazonaws.com/kosipefojaw/lijajezu.pdfIn PDF document text
    • https://s3.amazonaws.com/betefowubevat/konulalud.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_off0000ce74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE74 5824 bytes
SHA-256: acebe2022ea87d52151bc5139818465086e80b5cd72947263a2ec7a12b44a7bf
font_01_sfnt_off0000e216.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE216 10264 bytes
SHA-256: b25b1103a2bdb9bdab8210f50b3b3163d1ebaa5741c6abf1149c202e9aa2998f

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