Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fd18d0c45ab7258…

MALICIOUS

PDF

89.8 KB Created: 2021-03-20 13:22:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0a2b3febd6f628d95690a94e5e2ab7bf SHA-1: 15a9d98987203e68f5cbb1ee4aad322644a88669 SHA-256: 8fd18d0c45ab72586388a0eb0080883a97c526619eb0c63e387ac9d9805ebfd7
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, a technique often used for SEO link farms or phishing. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and extensive external linking suggest it's designed to redirect users to malicious sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://maypoin.ru/strik?utm_term=english+verb+list+with+tamil+meaning+pdf
    • https://static.s123-cdn-static.com/uploads/4484375/normal_600299588fef9.pdf
    • https://static.s123-cdn-static.com/uploads/4419218/normal_5fef00eaad511.pdf
    • https://static.s123-cdn-static.com/uploads/4417813/normal_5fdd5b2e50d7d.pdf
    • https://cdn-cms.f-static.net/uploads/4484363/normal_6041780ed52a7.pdf
    • https://static.s123-cdn-static.com/uploads/4414174/normal_5ff6a8ff24990.pdf
    • https://static.s123-cdn-static.com/uploads/4464072/normal_5fd09b55dfc4c.pdf
    • https://cdn-cms.f-static.net/uploads/4452850/normal_600dc77a55e9e.pdf
    • https://cdn-cms.f-static.net/uploads/4471941/normal_5fdc53fa0be93.pdf
    • https://static.s123-cdn-static.com/uploads/4488090/normal_5ff9ff5a9fbbe.pdf
    • https://static.s123-cdn-static.com/uploads/4460981/normal_5ff41b3912a85.pdf
    • http://fedorahosted.org/lohit
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cad90261-f038-4e8a-b384-2e0e37e6cb8c.filesusr.com/ugd/4c4e45_b2eb7218e90c443cba09dfeb1e57dc24.pdf?index=true
    • https://s3.amazonaws.com/mokamoba/free_subject_and_predicate_worksheets_for_4th_grade.pdf
    • https://uploads.strikinglycdn.com/files/a36b46cb-629f-4163-8a28-9e7407335855/my_dungeon_shook_letter_to_my_nephew_summary.pdf
    • https://s3.amazonaws.com/votubukaxogilix/70052763085.pdf
    • https://uploads.strikinglycdn.com/files/a5e4efe7-442d-44e3-a1b6-4e98043fb249/99564285980.pdf
    • https://s3.amazonaws.com/towutoginadivu/bloodstained_curse_of_the_moon_codes.pdf
    • https://s3.amazonaws.com/zopenave/lozowojuxafa.pdf
    • https://s3.amazonaws.com/wukevirenesu/56658407703.pdf
    • https://b2fc43c4-60ab-4dc1-a1c8-84833fda4e2a.filesusr.com/ugd/37321e_55305cc6318d42bb90d2c89735e8af90.pdf?index=true
    • https://uploads.strikinglycdn.com/files/e81299a5-ba13-4652-bbc5-265212707f53/82780486179.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00010b53.bin
ec4b636867c933183ad019d696cde0dffe915f9c0c8f6a3cc032021f9e81d181		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x10B53 17128 bytes
font_00_sfnt_off0000f804.bin
70d38cb2b77cd42595cf2eceea46d6a77b6713adfce94134d1219b587e7b15bc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF804 5704 bytes
font_02_sfnt_off00013240.bin
9a759b68f97c603c61c8e405936b54d7866ac8102f935c899e98a1f301990320		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13240 10848 bytes

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