Malicious PDF — malware analysis report

Static analysis result for SHA-256 f54ba3dc23db89d2…

MALICIOUS

PDF

82.7 KB Created: 2021-06-10 20:52:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 5b678b744a13ab9d89fc8a9d87bfd14a SHA-1: 3312a3b91186d1508f44a8758da113c30f01d260 SHA-256: f54ba3dc23db89d23f6a912c023abfe724285f9413f0fa132b4fed679015d406
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains a significant number of external links, many pointing to disposable domains, characteristic of a link farm or SEO spam operation. The presence of these links suggests the document's primary purpose is to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://philabc.ru/pbw?utm_term=litawachoma+zuchu+ft+diamond PDF link annotation
    • https://mujisenutefewe.weebly.com/uploads/1/3/4/2/134234616/57820f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402936/normal_6018eccd76827.pdfIn PDF document text
    • https://bivovipolever.weebly.com/uploads/1/3/4/3/134347360/tivivipovogas.pdfIn PDF document text
    • https://kexezesokofu.weebly.com/uploads/1/3/3/9/133986719/5b8e4ff6fe3641a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391907/normal_60be72e2a918d.pdfIn PDF document text
    • https://joxinisedubetif.weebly.com/uploads/1/3/4/5/134594754/jipixalukomivagebe.pdfIn PDF document text
    • https://tusosalowikos.weebly.com/uploads/1/3/1/4/131453146/zebopobegoz-topazoropaxisop.pdfIn PDF document text
    • https://foxodutamawasu.weebly.com/uploads/1/3/4/5/134587344/64aac22ff31.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488316/normal_6037e6729ecb5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482189/normal_6012c30343cab.pdfIn PDF document text
    • https://sedaduvu.weebly.com/uploads/1/3/4/5/134598683/6969023.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402032/normal_603805d5e7b00.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463010/normal_60616c35518a0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385410/normal_5fe4aed3807fa.pdfIn PDF document text
    • https://dumamigurox.weebly.com/uploads/1/3/4/3/134336195/d7d5ed34d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486201/normal_5fd2f43e55304.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487918/normal_60b9dc917354d.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/28186ff4-42a9-40be-86cd-47cad927caf4/81903258658.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e2a33d92-7a74-4c38-a749-394c95b7d58a/stress_management_tips.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5fa29fe4-321f-4a89-a334-8072f2edbeab/dell_precision_workstation_t5500_memory_configuration.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7ba186d1-222a-49c7-80f2-ead2eb33f285/kigadijaji.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/70c73d11-8bbb-410b-bce7-d9cf090e7f49/maschine_mikro_mk3_manual_french.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e101.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE101 5040 bytes
SHA-256: 0a9942ffb0db8d7e7f3da79fb9e820e9a84e59df19657dc8342ea5c28bab56e0
font_01_sfnt_off0000f21f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF21F 5740 bytes
SHA-256: 5fb8039ce42604803c47b795835d15167652756d4b1888b69a99fb583b5d287b
font_02_sfnt_off0001020d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1020D 10912 bytes
SHA-256: 6c6ca82b877e80b6c17a7d9607eed2a817c5c34d185f55a6645aaa18709def11
font_03_sfnt_off000127bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127BD 16144 bytes
SHA-256: f0a8b786da721c7415a59d91fbce3b20bbb98ea32e48857ac1ff22d53b00ec29

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