Malicious PDF — malware analysis report

Static analysis result for SHA-256 85267e31c1b3cb5c…

MALICIOUS

PDF

74.0 KB Created: 2021-01-12 18:53:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 241336f9f9332562802dfe6c41c0b3fd SHA-1: e92f6a0b8a343024aecf5d90403b8b23a81e32e7 SHA-256: 85267e31c1b3cb5c91ba4cb03e9a8d779246579b102abf9f66b03285de50c275
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and numerous external URLs point towards a malicious document designed to redirect users to potentially harmful content.

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 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://trafficel.ru/123?utm_term=.net+interview+questions+shivprasad+koirala+7th+edition+pdf PDF link annotation
    • https://site-1171482.mozfiles.com/files/1171482/18179458277.pdfIn PDF document text
    • https://site-1171454.mozfiles.com/files/1171454/70652689198.pdfIn PDF document text
    • https://riwusivi.weebly.com/uploads/1/3/4/9/134900433/7830622.pdfIn PDF document text
    • https://kidivine.weebly.com/uploads/1/3/4/5/134576756/wabitam.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449392/normal_5f9f628871729.pdfIn PDF document text
    • https://fakoronad.weebly.com/uploads/1/3/4/7/134712901/3851049.pdfIn PDF document text
    • https://site-1172901.mozfiles.com/files/1172901/97201507600.pdfIn PDF document text
    • https://zubetotuduve.weebly.com/uploads/1/3/5/3/135340520/zepedewutosekag.pdfIn PDF document text
    • https://site-1168371.mozfiles.com/files/1168371/pojipizalalijo.pdfIn PDF document text
    • https://pepotoxuxomupav.weebly.com/uploads/1/3/1/4/131483830/7613128.pdfIn PDF document text
    • https://tufiganifipira.weebly.com/uploads/1/3/4/3/134310976/nupujaxoset.pdfIn PDF document text
    • https://site-1166600.mozfiles.com/files/1166600/sheetz_claysburg_pa_16625.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ce68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE68 5488 bytes
SHA-256: 3d3b8c11b3fe9511b21b991e8590acbc95bef026899260667d7808d6643a8fed
font_01_sfnt_off0000e12b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE12B 10608 bytes
SHA-256: 76b5ae9a9b82a1e459dfc0bd4957186edf6fa5be34a1ae8014e06de58a058ad4
font_02_sfnt_off00010584.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10584 16164 bytes
SHA-256: ebd2804bff382343e08f6a42dc45f69f4e794c08b23908ae60ba78ededae74b1

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