Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7aed7ed243f962f…

MALICIOUS

PDF

91.4 KB Created: 2021-03-15 11:04:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 99b1f14485ff20a193f2439cb42309a7 SHA-1: 1c7600c0be6cf8f4228f17b2c3c3c503d75b6605 SHA-256: e7aed7ed243f962f9b284f51a3179fe390a8a9118ed8716c60eb84c343a46dd5
156 Risk Score

Malware Insights

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

This PDF file is identified as malicious by multiple heuristics and a machine learning classifier, specifically flagged as a phishing trojan. It contains a large number of external links, many of which point to other PDFs, suggesting a link farm or redirection mechanism. The primary URL, https://botokaw.ru/award?keyword=abc+chart+pdf+download, indicates a lure for a chart download, likely leading to further malicious content or phishing attempts. No scripts were extracted, but the PDF structure itself facilitates the malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/award?keyword=abc+chart+pdf+download
    • https://cdn.sqhk.co/mulepava/OKhajZj/18064601655.pdf
    • https://cdn.sqhk.co/gebitasixa/0gfhejj/26680575459.pdf
    • https://cdn-cms.f-static.net/uploads/4481527/normal_60184302a3b9f.pdf
    • https://cdn-cms.f-static.net/uploads/4451561/normal_5fd5f17b7b4c6.pdf
    • http://situvupumu.medianewsonline.com/dictionnaire_thmatique_maritime_anglais_franais.pdf
    • https://nugukofijopi.weebly.com/uploads/1/3/2/7/132712180/30db62806.pdf
    • https://cdn.sqhk.co/dinigivo/pAjgsf7/infinite_loop_youtube.pdf
    • https://cdn.sqhk.co/napefabet/jha6Xhc/lewisham_council_report_anti_social_behaviour.pdf
    • https://lifulufo.weebly.com/uploads/1/3/1/3/131379971/7242903.pdf
    • https://denowulak.weebly.com/uploads/1/3/3/9/133997299/gorofaped.pdf
    • https://cdn.sqhk.co/ripalufix/hbkifjc/ducks_vs_beavers_civil_war_2019.pdf
    • http://zezasarasojid.mywebcommunity.org/5984472163.pdf
    • https://cdn.sqhk.co/nepofigiper/ihib83l/offroad_car_simulator_3.pdf
    • https://cdn.sqhk.co/vifutetax/jiuigib/wivemexonigirabeb.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/85820da2-d52e-4a9d-afc7-b1b24a0d9d99/mizukule.pdf
    • https://uploads.strikinglycdn.com/files/10dcd28f-76a0-4bde-8d8f-e1ba6c140dad/quote_red_queen_alice_wonderland.pdf
    • http://nogafojomor.onlinewebshop.net/house_of_the_rising_sun_guitar_chords.pdf
    • https://uploads.strikinglycdn.com/files/9fc91467-15af-4357-8649-8f2e4e28af50/zonoruwinebajikoruwegewof.pdf
    • https://uploads.strikinglycdn.com/files/afe9c588-18cd-4d41-ba82-cb8854b0862a/how_to_clean_my_cuisinart_coffee_pot.pdf
    • http://girofili.myartsonline.com/xosexuvemogozukexum.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_off00012915.bin
8e70b4d75003615d8c2c93d5329375f1d819d8c5f33b9bb3165783020a6ca39e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12915 5288 bytes
font_01_sfnt_off00013b1a.bin
eba6759a36cac545d653182ae67ebb7af4b06a5c018307bbe600609ce687c8ba		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13B1A 11068 bytes

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