Malicious PDF — malware analysis report

Static analysis result for SHA-256 a589108af570e0ce…

MALICIOUS

PDF

65.2 KB Created: 2021-03-02 04:46:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: d0a82c404df932355d07312ea7818ab8 SHA-1: 63a96f7fd7f2e7847ee6ca3417acc85ad0112bae SHA-256: a589108af570e0ce97ca80714fdae7eb9768d279ea6304c5d5d5a16d1cfa668a
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The ML classifier also strongly indicated maliciousness. The document body appears to be obfuscated or corrupted, but the presence of numerous external URLs points towards an attempt to redirect users to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://seumenha.ru/strik?utm_term=rainbow+vacuum+power+nozzle+e+series PDF link annotation
    • https://xidaxawefitorat.weebly.com/uploads/1/3/5/9/135958331/71681.pdfIn PDF document text
    • https://guxovixig.weebly.com/uploads/1/3/5/3/135317997/3704dbf.pdfIn PDF document text
    • http://businessoutsourcing.org/sylvania_bulb_guide_h11vjyrv.pdfIn PDF document text
    • http://mists.space/6645368962am9hb.pdfIn PDF document text
    • http://morpeoplelife.ru/what_whirlpool_washers_are_being_recalledx7on6.pdfIn PDF document text
    • http://betmoy56.com/red_wine_for_beginners_in_indialm5xi.pdfIn PDF document text
    • https://lilikisewusufod.weebly.com/uploads/1/3/2/6/132682662/novopije_vofom_zuvedekudidizo_xojuwugafum.pdfIn PDF document text
    • https://budorezaru.weebly.com/uploads/1/3/4/8/134859022/navilavafatofuvujir.pdfIn PDF document text
    • http://lonagonem.22web.org/65177917056.pdfIn PDF document text
    • https://velazidolis.weebly.com/uploads/1/3/0/9/130969689/4224961.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384472/normal_603d90072c0c3.pdfIn PDF document text
    • http://lurodug.iblogger.org/wonobidararejerujezanijis.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jajapelemazibog.rf.gd/xalufekosusabe.pdfIn PDF document text
    • http://betelenederope.epizy.com/doctor_sleep_sequel_novel.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_off0000bcc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCC6 5428 bytes
SHA-256: 31f22373bf68876ece5487ab8ec52a148e080c0b4457585ff9b419f426521cd0
font_01_sfnt_off0000cf47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF47 11600 bytes
SHA-256: 96063d0ee9d42e9d54ac1d2cbcdf799b12385d1e0a6eec7a8552805243ee8de1

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