Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc9c70ebf4ba9e2d…

MALICIOUS

PDF

79.5 KB Created: 2021-01-11 22:50:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b6e9505cd1fbe7b0128beb9eb03e5ed2 SHA-1: d132b42dbd3ecc420d3db6733e8f9c371675fc79 SHA-256: bc9c70ebf4ba9e2d3fb236c5bda0a72d8fbca52c1712b87b63062f8ec8b8a54f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous embedded URLs pointing to disposable domains and link farms, suggesting a phishing or scam operation. The PDF's structure and content, including the presence of multiple external URIs and its classification as a link farm, strongly support its use in directing users to malicious websites.

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://traffine.ru/aws?utm_term=learner+centered+approach+examples+pdf
    • https://site-1168144.mozfiles.com/files/1168144/viluwenud.pdf
    • https://vegirizixe.weebly.com/uploads/1/3/4/7/134716682/jexapororu.pdf
    • https://joxenunufob.weebly.com/uploads/1/3/1/6/131606789/ledukuzigop-falarotijol-nipewaliv.pdf
    • https://gikemadisasov.weebly.com/uploads/1/3/4/6/134667176/kojasudedu.pdf
    • https://site-1199973.mozfiles.com/files/1199973/sovezaropojuvixo.pdf
    • https://dojudiwoju.weebly.com/uploads/1/3/1/4/131406456/350c5.pdf
    • https://site-1176516.mozfiles.com/files/1176516/add_text_to_photo_android_app.pdf
    • https://site-1180061.mozfiles.com/files/1180061/master_assassin_5e_build.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/xamapebonijos/bar_graph_worksheets_grade_2.pdf
    • https://s3.amazonaws.com/sowirutelevolur/civilization_5_free_android.pdf
    • https://s3.amazonaws.com/topipovikapari/faker_ryze_guide.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fa42.bin
1a58c5a041c3b9c9b6a50c24506ed62d2892c0e852ef620f89918b317b958bb2
pdf-font-stream PDF embedded font (sfnt) at offset 0xFA42 5404 bytes
font_01_sfnt_off00010c82.bin
59cc9385db50eaa6b6dc34fd36971d848eb3bbb16204c469bfdc669be95c096e
pdf-font-stream PDF embedded font (sfnt) at offset 0x10C82 10752 bytes