Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb3473576b00dd8d…

MALICIOUS

PDF

78.4 KB Created: 2021-05-03 13:25:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a65e6940c9f216c8f3f5c431f17ffdad SHA-1: dbc47d92685d11be3e47b748faef9b7727250798 SHA-256: bb3473576b00dd8d48d1ed8cf0cf70d7a5d134651f5d01084a4416efe114f0ae
186 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of a large link farm, with many links pointing to disposable hosting and including UTM parameters, strongly suggests a phishing or redirection scheme. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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
  • 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://botokaw.ru/strik?utm_term=half+broke+horses+book+club+questions
    • http://kugetogegus.iblogger.org/simple_birth_plan_template.pdf
    • https://static.s123-cdn-static.com/uploads/4417309/normal_6006692485de0.pdf
    • https://cdn.sqhk.co/zumufapofow/dKhdha7/asteroids_atari_2600_online.pdf
    • http://zaduzoronogikex.22web.org/pronunciation_of_words_in_english.pdf
    • https://cdn-cms.f-static.net/uploads/4501027/normal_600c4b50e59e2.pdf
    • http://raxosiwu.22web.org/45732424309.pdf
    • https://static.s123-cdn-static.com/uploads/4411491/normal_5ffe19bb70646.pdf
    • https://cdn.sqhk.co/sosobita/cghrggj/96598810715.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://61249681-e2d1-4375-841a-b3723294d79c.filesusr.com/ugd/3d514e_f2e57eb5f02b4a2f865a7886e56dbcae.pdf?index=true
    • https://d5aacb37-8766-4234-9cc8-c2ec3b911aba.filesusr.com/ugd/1e723b_8bdf1874619041ef8126f8d989634bfc.pdf?index=true
    • https://de2a8dfc-dc8d-4d62-be3b-f97abdd17bf6.filesusr.com/ugd/c722c2_b138767239044435ad0f02de422f7950.pdf?index=true
    • https://d1897088-ef6e-4b60-8303-910b4b551fc1.filesusr.com/ugd/4cfbbd_2f49203e361e41d1be004359b3d082c4.pdf?index=true
    • https://5e54d98c-4257-4cc7-9010-48f3df296eb2.filesusr.com/ugd/05240c_d7dde0793194456389639ade7f20ec0e.pdf?index=true
    • https://288c7b4b-0494-48f6-8ee2-9dd519b96b0a.filesusr.com/ugd/a107db_28dc5f5613d34237944fc19dfb9d9d0d.pdf?index=true
    • https://168d2a81-f750-40c6-a653-3787650f980d.filesusr.com/ugd/3bcfef_074c66b781f844d18dc5930c27375c29.pdf?index=true
    • https://425e2ee7-996f-4c6d-a593-b44a2a39b733.filesusr.com/ugd/bb05c1_87222110704445e7b4516243dd12a9c8.pdf?index=true
    • http://jewikotadukusug.rf.gd/how_much_is_10000_euro.pdf
    • https://6e7ef639-f89a-4701-86f9-710a836f1183.filesusr.com/ugd/12745a_9a31ad62436348a2a9442fa56fe6f43b.pdf?index=true
    • https://fc060a1e-8c1d-4b7d-bafd-75f79d4c6355.filesusr.com/ugd/c0a468_0e0bb78e67fc46abbe5f948c737f1b20.pdf?index=true
    • 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f58c.bin
d27079c51150668ddaacbd5ed00b3f8ae27fd6a7359b22201762aeda2dba607d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF58C 5260 bytes
font_01_sfnt_off0001076a.bin
d35e89edfcbee6bf34362a392ebd842032d5a845ee14440611449ce04e5010f6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1076A 10868 bytes

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