Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a1389816cfb87af…

MALICIOUS

PDF

81.6 KB Created: 2021-03-29 09:52:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cf1500cfaa4f3c5a32f2309620aa05e1 SHA-1: b03e99a60c11f1e0b7c4d49b0b35c584fe315a19 SHA-256: 3a1389816cfb87af74a424145f619ba2bd62ac7fbbd0925f7d44590376881c57
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the 'PDF_SEO_LINK_FARM' heuristic, suggesting it's designed to redirect users to potentially malicious sites. The ClamAV detection and ML classifier further indicate malicious intent, likely related to phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and embedded URIs are strong indicators of a malicious link farm attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://seumenha.ru/strik?utm_term=ray+dalio+principles+book+recommendations
    • https://cdn-cms.f-static.net/uploads/4384149/normal_6057dada71644.pdf
    • http://rubka.space/what_are_the_4_types_of_sentence_structuretxxwt.pdf
    • https://cdn-cms.f-static.net/uploads/4402520/normal_604658cc3a0af.pdf
    • http://prodson.space/integrated_physics_and_chemistry_textbook_mcgraw_hilluwbn4.pdf
    • https://static.s123-cdn-static.com/uploads/4454558/normal_5fdf66a1e6e8d.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://68e1e3d4-268d-49bc-a8aa-b119cb10fea7.filesusr.com/ugd/3ceeb9_fb84c80f02934b28970b373f90c614cf.pdf?index=true
    • https://s3.amazonaws.com/fuzafuzeruwit/pulmonary_hypertension_canada_guidelines.pdf
    • https://901b9152-9067-49c5-8541-bb90c1a77dfa.filesusr.com/ugd/5d84e8_c2ffdb2bb1b546049e6530a6dc116319.pdf?index=true
    • https://s3.amazonaws.com/pozokimepe/ff14_fashion_report_100_reward.pdf
    • https://a39ac558-8fe8-437d-9e10-dc9402d6cb9c.filesusr.com/ugd/1ebe14_6153f3c1b80440569ffffd3a15f0f0ee.pdf?index=true
    • https://s3.amazonaws.com/tikoweravisixu/tarse_ye_naina_avneet_kaur_song.pdf
    • https://ce5d016b-e5fb-4004-af8f-35f61b829e22.filesusr.com/ugd/d7d7f8_a0d9b8d98eec4c79986dbaf74df6fc62.pdf?index=true
    • https://05f6fcc2-a4c7-4d5b-b58c-97b640a93f4d.filesusr.com/ugd/74147a_5d8e6ea052614e30b7f82d5d351863d2.pdf?index=true
    • https://s3.amazonaws.com/bisiku/22833415979.pdf
    • https://s3.amazonaws.com/jubiferekaka/dedevowokafosax.pdf
    • https://dc010c70-835d-4b56-8cb0-1e1bda7cab64.filesusr.com/ugd/fb576b_6221a0180f2d445a8473edcb514cf8ad.pdf?index=true
    • https://ede36962-9452-4451-b182-fa4236ba9bc6.filesusr.com/ugd/83b1b3_b795e03afcba431aa97a18cc60f7a817.pdf?index=true
    • https://s3.amazonaws.com/vipinib/43871863476.pdf
    • https://4cd5eafb-d261-4666-a528-29b55b1676c1.filesusr.com/ugd/8dde66_c5d2737c104a4b07856e904a7cdfdac3.pdf?index=true
    • https://c83cbd6e-a134-4b49-ba12-49f24c654ad9.filesusr.com/ugd/904a8b_e37f9f1bf224460f89912cae6908f299.pdf?index=true
    • https://s3.amazonaws.com/mubefula/33076686504.pdf
    • https://ccd4a2e6-63e2-4dcb-a02e-1ae1253dabcc.filesusr.com/ugd/059ff1_fad8838925a04912935d05843f0ac2d7.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f3fa.bin
6869eb866b65a6e78b53e85e29cfe9979711c7fd5ecb33dc1e119da602e7ae9d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF3FA 5320 bytes
font_01_sfnt_off000105fa.bin
8bfe298595fff345a0e8c2d7db4440183dc3ae8eb5dec5e4cb2d757cb567c8b1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x105FA 10984 bytes
font_02_sfnt_off00012b4e.bin
ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12B4E 4324 bytes

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