Malicious PDF — malware analysis report

Static analysis result for SHA-256 8645179571e5cb11…

MALICIOUS

PDF

75.3 KB Created: 2021-03-29 09:52:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fc9bf237d311c294cc9a0430b8299a22 SHA-1: bda4c1b7b95e29b5ca2460702d67fd3343e563b5 SHA-256: 8645179571e5cb113774e4c25baa9c9e207ca628f64687d9aec4a130abfcce84
154 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a common tactic for phishing or distributing malware. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, with one pointing to 'https://seumenha.ru/strik?utm_term=ray+dalio+principles+book+recommendations'. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9448

Heuristics 4

  • 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
  • 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
    • 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://scripts.sil.org/OFL

Extracted artifacts 2

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

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