Malicious PDF — malware analysis report

Static analysis result for SHA-256 63fb97f8374b8286…

MALICIOUS

PDF

69.9 KB Created: 2021-01-14 12:42:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: ecf7b1ce6a996384d0b2e04d242abe2d SHA-1: c2ca44c399223a8c17dff5ad26241fc3b0557040 SHA-256: 63fb97f8374b8286ac8fe58c9ee8a2266825674083d5f1c80282692787100d94
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded URLs and the PDF structure suggest a phishing or scam attempt, likely using a spearphishing attachment vector. No scripts were extracted, but the overall pattern points to a malicious document dropper.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://traffset.ru/aws?utm_term=aegrotat+form+unisa+2017 PDF link annotation
    • https://donedujawag.weebly.com/uploads/1/3/4/3/134315137/jofudarojo.pdfIn PDF document text
    • https://site-1168144.mozfiles.com/files/1168144/1364585670.pdfIn PDF document text
    • https://cdn.sqhk.co/tunuzasana/fiegeXt/black_friday_2019_iphone_deals_verizon.pdfIn PDF document text
    • https://wivixape.weebly.com/uploads/1/3/4/8/134897282/2a9dd174b4.pdfIn PDF document text
    • https://dejolezeg.weebly.com/uploads/1/3/2/8/132815968/mimadawa-nuguje-sanagatog-mupagiser.pdfIn PDF document text
    • https://cdn.sqhk.co/jumifokujuje/2wSthjF/61746318628.pdfIn PDF document text
    • https://vujuzujotug.weebly.com/uploads/1/3/4/4/134478410/jekanabokog.pdfIn PDF document text
    • https://cdn.sqhk.co/sifolilo/hhhdahg/96272119218.pdfIn PDF document text
    • https://site-1236897.mozfiles.com/files/1236897/78290029707.pdfIn PDF document text
    • https://kofiserifopame.weebly.com/uploads/1/3/2/7/132741397/8479671.pdfIn PDF document text
    • https://www.unisa.ac.za/static/myunisa/Content/documents/AegrotatIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/buwosevax/fun_itinerary_template_google_docs.pdfIn PDF document text
    • https://s3.amazonaws.com/voxipanovigepiv/bengali_play_script.pdfIn PDF document text
    • https://s3.amazonaws.com/tejuvonixag/coumadin_davis_drug_guide.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d37c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD37C 5452 bytes
SHA-256: 224a1625fe067925ad74ebf4bdc289be70201e4b8c265fdaa430ecd7544ec165
font_01_sfnt_off0000e601.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE601 10860 bytes
SHA-256: 50a029636b7f91d6d1068bb88bffe1c61847bb49433d4567dff25d8e8e0a3f37

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