Malicious PDF — malware analysis report

Static analysis result for SHA-256 dffedc490a0585c1…

MALICIOUS

PDF

71.0 KB Created: 2020-12-26 19:52:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: f6f8c7d2c197f5db8258ab8a0a7c5c3c SHA-1: 3da1b2de24eaf8627f5b1b5b2b7992033a9326d4 SHA-256: dffedc490a0585c13029cef7eb096229aba5340c9153032f77d7fefaaca3ab11
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO spamming operation. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external URLs point towards a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://trafffi.ru/strik?utm_term=basketball+game+rules+for+beginners PDF link annotation
    • https://kozivusetusi.weebly.com/uploads/1/3/4/2/134234967/9dffa7d1d48.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389095/normal_5f8fe378ad6a0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409409/normal_5fe5e3d72f810.pdfIn PDF document text
    • https://dekitinuro.weebly.com/uploads/1/3/4/8/134871397/434b320f9.pdfIn PDF document text
    • https://nulesurusisozi.weebly.com/uploads/1/3/4/7/134744420/7084271.pdfIn PDF document text
    • https://cdn.sqhk.co/tobetusibu/dRDjhhb/merge_survival_zombies.pdfIn PDF document text
    • https://cdn.sqhk.co/saseponirifa/cqFpgcg/pretend_play_ghost_town_haunted_house_game_unblocked.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/pazifetanegapu/basonanum.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/83ecd4bf-d1d3-4973-ae68-943770d22bec/16_personalities_premium_profile_infj.pdfIn PDF document text
    • https://s3.amazonaws.com/falufusu/devious_devices_assets_extension_and_integration.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/192d37f4-7fe0-4ca4-ac3f-a4d615d30a46/ap_human_geography_chapter_6_religion.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4898edb5-4ed9-48e9-83ab-96cfb9336600/vasasemifixupedagarifadiz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/caebf80d-f7fe-4a62-8a9c-9f24ffaaa8bf/61978817691.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0cf4a1a0-4709-4d34-bdd7-a249c09c5747/senate_majority_leader_mitch_mcconnell.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_off0000d945.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD945 5340 bytes
SHA-256: becc7df2ab509289d0278f9cf6afce26ecb2cbc61e5a539147ee6f30964892fb
font_01_sfnt_off0000eb63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB63 10272 bytes
SHA-256: 9ed9c39afdfdcb70c07c5264f4cdaec142240d3e7229e3de9dff3927c4e9316b

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