Malicious PDF — malware analysis report

Static analysis result for SHA-256 0426fc674b9a4e90…

MALICIOUS

PDF

78.0 KB Created: 2021-05-27 20:26:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 3bc7d0fa86c5b349cf3ec4c3d1700e0c SHA-1: e3379889fe5b546df477ea51c0dbfbf7b37c1c05 SHA-256: 0426fc674b9a4e901ef3686224f4d8c3eca711a064291d75b64fcb3a835c58f8
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-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://kuzutuzo.ru/strik?utm_term=anjaneya+dandakam+lyrics+in+telugu+pdf+free+download PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4365525/normal_5fcfa466740d2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452389/normal_604308c639fa6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415934/normal_601e701ce507c.pdfIn PDF document text
    • https://nelinijamewugin.weebly.com/uploads/1/3/1/0/131070382/9402941.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477367/normal_6033e2371a877.pdfIn PDF document text
    • https://kazirevuteguzug.weebly.com/uploads/1/3/2/6/132681824/kijivajoragalakinivo.pdfIn PDF document text
    • https://matowesefuwuw.weebly.com/uploads/1/3/4/5/134592497/punaxaz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393890/normal_5fdc0eb59aa73.pdfIn PDF document text
    • https://jelisewisu.weebly.com/uploads/1/3/1/4/131410299/pegiz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449629/normal_6053e410d70b3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480397/normal_5fe8d56d4b0ee.pdfIn PDF document text
    • https://mesemexuganu.weebly.com/uploads/1/3/1/4/131437531/f672be.pdfIn PDF document text
    • https://pipewasages.weebly.com/uploads/1/3/4/0/134017488/kunosatisixanopuz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368788/normal_6060f3bea4f99.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/69dd19f7-ed63-42f2-a422-1b3b55f00038/mezejuxupe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2069a669-2a01-41dd-aab5-385b545fb973/fidedudugapovebevolin.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/387eae8e-35bd-4a45-865e-2b60e0452749/honda_160_pressure_washer_oil_change.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/82472fd7-6c5f-4846-8f24-99647e45505e/how_to_make_a_simple_drone_that_can_fly.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/500a4237-7c24-4f48-90bc-5a0b277c2313/gobadevavimo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0de5737d-6d51-49b3-9424-82a97faaa494/dsc_1555_reset_master_code.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/adf06b57-7a5e-4115-b907-0a8ce5cf3c70/12813042730.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_off0000f4ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4AC 5800 bytes
SHA-256: fe23e1e30ef739b77c8711dbd366ce47026d8fc16bdd1b910e4e2b59e896296c
font_01_sfnt_off00010879.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10879 10016 bytes
SHA-256: cf8e7b010c6713419330acebe4b5459e246d093d132713458cf75fd247233100