Malicious PDF — malware analysis report

Static analysis result for SHA-256 0654a7e966a46da0…

MALICIOUS

PDF

84.8 KB Created: 2021-04-05 00:50:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 37d2986b4fda85e739d5f45d9db95fd4 SHA-1: cf1971ad246314b155e1416be761ee4aadc2aaa9 SHA-256: 0654a7e966a46da04f3b46dab1ed434dfe1fe881376f1317c1333168e9628654
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable domains, suggesting a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as phishing. While no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to redirect users to potentially harmful sites.

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://bologen.ru/strik?utm_term=why+is+color+theory+important+in+graphic+design PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4369495/normal_5fc843c07ebc7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420597/normal_6025bb90c6bdd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384832/normal_60262f3938640.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393925/normal_5fd1b4a897c4b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462362/normal_6043140e20ae7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403274/normal_603aabc438d04.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480399/normal_6008f97b89337.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470703/normal_5ff62af1c8fb6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370078/normal_5fcaf7a6ecd9f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376357/normal_603085cbbb48c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369494/normal_5febb0bf261bb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://89d9876f-4e47-4433-ab5b-8da47ae3ae5c.filesusr.com/ugd/37c326_22cffde09e0e4cbeaa666d5b0dc27b7f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7abbeabd-525e-4070-b6e6-d0743226c62b/38993982264.pdfIn PDF document text
    • https://923a8ca3-316b-4844-b38f-9bc955ad4852.filesusr.com/ugd/312e0e_be062079eebe4f909b3c0004a3f976ab.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/016dba3a-3062-4caa-b6ab-599f97c5a363/baby_groot_planter_kit_instructions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/69bf6d94-8c92-4ac5-ab95-54e79310d9e8/is_pentax_k_70_a_good_camera.pdfIn PDF document text
    • https://bbaef297-c986-4b42-acb3-0fd65605e280.filesusr.com/ugd/e9fc71_7e6bad05a5874dce83fd8e81b6614d22.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/dab97393-b171-4a57-9dbd-0625fbd7be1f/technical_writer_internship_nyc.pdfIn PDF document text
    • https://db244590-af71-4c33-bd6e-2f8f55f31281.filesusr.com/ugd/fdab61_1270e4949ab84e58a940b93e7f81a7a5.pdf?index=trueIn PDF document text
    • https://bb55feb6-a0c4-48ae-8f72-aea2c45912f8.filesusr.com/ugd/b9801a_ee63bd9550434ffea59104614d5a1f34.pdf?index=trueIn PDF document text
    • https://006b50d4-ad2a-4261-8279-34542eb0d7b0.filesusr.com/ugd/a640e9_e9e18d1c8b6f4125ba75ad2622f86bc9.pdf?index=trueIn 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_off00010eb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EB0 5600 bytes
SHA-256: a56a3b387a27d85785c2637d39cc7bd08b41d7a20858dd1c9a77a3f71dffc619
font_01_sfnt_off000121a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121A1 10476 bytes
SHA-256: e6120f8703c7206c4f314274bb87253dd205dd364bd9b9bde98fcc57f574cb4f