Malicious PDF — malware analysis report

Static analysis result for SHA-256 faf7fd4256c43865…

MALICIOUS

PDF

75.3 KB Created: 2021-06-07 06:06:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: ef633067468964da7c2a013fa5c5b597 SHA-1: bca578e3b80c09ab3ab0afdf694dcd1248a8e9cf SHA-256: faf7fd4256c43865d51e02cae490428ca4505a345962eb7e4d43a95e33d870d4
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://nipisod.ru/123?utm_term=student+database+management+system+template PDF link annotation
    • https://solupezonideb.weebly.com/uploads/1/3/4/5/134597414/7514063.pdfIn PDF document text
    • https://fiwazapabuw.weebly.com/uploads/1/3/4/3/134357015/a4994f47e4a8ad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449973/normal_6030dd07e63ec.pdfIn PDF document text
    • https://kewetarutedur.weebly.com/uploads/1/3/0/9/130968996/jutunedoduzivuke.pdfIn PDF document text
    • https://gogijufiwadika.weebly.com/uploads/1/3/4/5/134581681/9532772.pdfIn PDF document text
    • https://sawuwirepugasup.weebly.com/uploads/1/3/0/9/130969548/naluxunuk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393188/normal_6007ef30a8839.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465688/normal_60391ce9931c7.pdfIn PDF document text
    • https://bidiruvinevuf.weebly.com/uploads/1/3/1/3/131379477/ff3360012a996.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367941/normal_6050e2878071d.pdfIn PDF document text
    • https://rexanofodifedow.weebly.com/uploads/1/3/1/3/131378899/pirokoteju-negopes-sifugub.pdfIn PDF document text
    • https://juwimifabofif.weebly.com/uploads/1/3/4/3/134369341/5886738.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410217/normal_5fd0fff0681e2.pdfIn PDF document text
    • https://zinalojirade.weebly.com/uploads/1/3/4/2/134266028/titon.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464327/normal_606eaa8cf12c3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373769/normal_6047f6f364e0e.pdfIn PDF document text
    • https://vakuvovigoder.weebly.com/uploads/1/3/4/4/134467198/vipis_medonasegevu_wipezezi_pibozegotu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443819/normal_5fe88936cb031.pdfIn PDF document text
    • https://makukojubava.weebly.com/uploads/1/3/0/7/130739489/4d1e73518ab.pdfIn PDF document text
    • https://kepinofex.weebly.com/uploads/1/3/4/0/134017679/firagelof.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA43 5528 bytes
SHA-256: 13db2646a7a3030851d1fe8d63bd424da479e4d1d13a248b6f70266d473f3b2e
font_01_sfnt_off0000fcff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCFF 10144 bytes
SHA-256: e47865d06659844a98ed78343c512b9e66467231b1bdd10620e985b5b86e9bb1