Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a13094828d4bb48…

MALICIOUS

PDF

78.4 KB Created: 2021-05-07 11:26:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d71443522141b96211e1be625e2f6104 SHA-1: d57a91af1b566cc4f614371a108c8b2a12418757 SHA-256: 9a13094828d4bb48c017ad35df96ac4562ae5ae556708e2a7199dbe218a32b68
156 Risk Score

Malware Insights

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

This PDF file exhibits characteristics of a link farm, embedding a large number of external URLs. The primary URL, 'https://botokaw.ru/strik?utm_term=how+to+take+whirlpool+cabrio+dryer+apart', suggests a potential phishing or spamming attempt disguised as helpful content. The ClamAV detection and ML classifier further support its malicious classification, indicating it is likely a phishing or trojan delivery mechanism.

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://botokaw.ru/strik?utm_term=how+to+take+whirlpool+cabrio+dryer+apart
    • https://penotogales.weebly.com/uploads/1/3/1/4/131438478/vuvuwiwoja_wumifiv_ludeludubabuki.pdf
    • https://static.s123-cdn-static.com/uploads/4489263/normal_5fe30896db923.pdf
    • https://cdn-cms.f-static.net/uploads/4383699/normal_603332277b3bf.pdf
    • https://niwitibu.weebly.com/uploads/1/3/1/6/131636677/5664301.pdf
    • https://static.s123-cdn-static.com/uploads/4459034/normal_5ff7bfc5517fa.pdf
    • http://sikudej.22web.org/how_to_write_a_conclusion_paragraph_for_a_research_essay.pdf
    • https://cdn-cms.f-static.net/uploads/4487905/normal_600df14379a5e.pdf
    • https://dekedenavit.weebly.com/uploads/1/3/4/6/134612093/vanedozikezisevile.pdf
    • https://static.s123-cdn-static.com/uploads/4379048/normal_6003a4feb4b5a.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://basemamexirenaw.epizy.com/le_petit_nicolas_film_summary.pdf
    • https://855e1e5b-0daf-4dce-aa73-dfad2bfec5df.filesusr.com/ugd/ced2dc_e7117c80e52643418b33d96936b2e5a4.pdf?index=true
    • https://s3.amazonaws.com/baxegezivumi/critical_ops_mod_menu_ios.pdf
    • https://uploads.strikinglycdn.com/files/256270d1-6c29-478f-b6d5-4560d00b3e77/77712942068.pdf
    • https://cb70cc59-2297-49c3-b7e2-2ac7e26e28d4.filesusr.com/ugd/4479ed_90c9595d9e3e4547b6ac151e37be1913.pdf?index=true
    • https://89e5ed4a-33eb-42a6-b5f1-9fc07ea1e15b.filesusr.com/ugd/ff68bb_cbac0aa0644c432f90ec9d0513cb066e.pdf?index=true
    • https://s3.amazonaws.com/safenalavojuwu/the_left_hand_of_darkness_quotes_with_page_numbers.pdf
    • http://tejusadesivuti.epizy.com/marketing_strategy_textbook.pdf
    • https://s3.amazonaws.com/baxegezivumi/backtrack_5_image_for_android.pdf
    • https://uploads.strikinglycdn.com/files/4d74f301-9fb8-436f-981d-9552e823b3a4/resezalujagetobenetixel.pdf
    • https://5f8b0e40-2141-4341-98ab-6145db4b8156.filesusr.com/ugd/2072cd_99d454a97d774a609ab6e3cd1746a06a.pdf?index=true
    • https://uploads.strikinglycdn.com/files/1f1262ad-3a8d-42bf-8470-4e4937321cf8/add_mp3_to_garageband_iphone.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f5b7.bin
49ebe073855077487e50f1cfe2c59c1cfee8036f18dd39ca7ed04c5bddf06165		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF5B7 5340 bytes
font_01_sfnt_off000107eb.bin
7489e524be7d0fab7ea5736400ef5c85e39c05b45d6839b056d15a882957620e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x107EB 10616 bytes

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