Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4366991175fa737…

MALICIOUS

PDF

79.7 KB Created: 2021-06-07 10:47:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-06-05
MD5: 08aeea3b3f4faf96a90b4025d2e80698 SHA-1: c2b6d53657b2f54cd04ef6e8c371e832887e58e8 SHA-256: b4366991175fa7370654f37be5c5e24357613288dd67cd8a8c278afb233fca0f
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 pointing to disposable hosting services, indicating a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. The embedded content, though heavily obfuscated, appears to be part of the lure, directing users to external URLs.

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://archism.ru/wb?keyword=digital%20fortress%20summary%20chapters PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4368500/normal_605715e757539.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370304/normal_60565f90c14dc.pdfIn PDF document text
    • https://bipesulevawitod.weebly.com/uploads/1/3/1/4/131437914/21309.pdfIn PDF document text
    • https://rawitexebava.weebly.com/uploads/1/3/4/4/134487877/9008277.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413838/normal_6036503292a59.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367294/normal_6065dcf8312d5.pdfIn PDF document text
    • https://nopiroradonumiw.weebly.com/uploads/1/3/4/4/134401961/limejumodu.pdfIn PDF document text
    • https://rikidunojig.weebly.com/uploads/1/3/4/4/134488605/muxutiretazodaxapeg.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415783/normal_5fe645c4d0786.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368955/normal_600ad91ade15c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4530910/normal_5ffdaafe967f7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416787/normal_605c2e78070e8.pdfIn PDF document text
    • https://daxivikulogator.weebly.com/uploads/1/3/4/3/134308382/cbea78d34.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411489/normal_5fe8194f7b5be.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/def741e1-f409-4594-8e77-7aba5c385779/acs_periodic_table_blanket_for_sale.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2281369f-545b-47a4-81f9-b7fcda403972/22094468389.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7979f230-f5f5-43a6-8727-afd7ce340d69/36492780161.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e7145aae-1c4f-4b87-9249-5902bc86a584/tikadizejufudotivotefig.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/88bb328a-3646-4cdd-88e8-0fcd87feabf3/gofofipivajuladezopil.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6186e37e-958f-462b-bc1b-81f17a11c204/24609692194.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/16a60a34-00f6-419c-a8ea-fec1ea7062ea/warrior_cats_movie_trailer_2018_official.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_off0000fa46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA46 5528 bytes
SHA-256: 05c6002c1f9bdac08aea9f331bec2c977a5d0e3286d6b81e28cd32064ed04047
font_01_sfnt_off00010d06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D06 10752 bytes
SHA-256: c50c5f47f69f5919980e7101f5cdaa0eeaf8105732e58e850a8cd3cec381d8f9