Malicious PDF — malware analysis report

Static analysis result for SHA-256 a61378fbf6c367f9…

MALICIOUS

PDF

73.6 KB Created: 2021-03-05 06:03:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: f65e06971d80570bb20daa565d55063a SHA-1: b7f880ec1dab86848d8bc397ead928b718eab168 SHA-256: a61378fbf6c367f91f11c8278dd26514ec5e75ab409decb0789b35f2418f9b4b
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous external URLs, some of which are hosted on disposable domains. The primary URL, 'https://seumenha.ru/award?keyword=diferentes+tipos+de+aparatos+y+sistemas+del+cuerpo+humano', suggests a potential phishing or SEO manipulation tactic. While no scripts were explicitly extracted, the PDF structure and the presence of external links are indicative of techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8872

Heuristics 5

  • 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 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.
  • 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
  • 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/award?keyword=diferentes+tipos+de+aparatos+y+sistemas+del+cuerpo+humano PDF link annotation
    • https://cdn.sqhk.co/negolura/ibie7ib/85002323970.pdfIn PDF document text
    • https://cdn.sqhk.co/poxofufiko/fiAgiHn/71676646626.pdfIn PDF document text
    • https://cdn.sqhk.co/jipodipotaj/jhbhcid/mr_bowling_ball_arborvitae_care.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374839/normal_60174649cd46b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385202/normal_6041670b281a7.pdfIn PDF document text
    • https://cdn.sqhk.co/kuzaxepigi/fcggaja/zedge_ringtone_app_for_ios.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490116/normal_5fef7adf3f5fc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://50fe66f1-00be-429c-ab6c-57a9f80d6ab9.filesusr.com/ugd/39cb9d_5ba46f2e10f14d619c943d3266ce5eb5.pdf?index=trueIn PDF document text
    • http://tusuzexuwijoki.rf.gd/97376360822.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/916a6e93-93a5-47bb-8be5-119a5cbf4edc/oreck_xl_hand_vacuum_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/24f3582a-e6cd-48df-a638-6e0784dc4be8/what_are_all_the_harry_potter_movies_in_order_from_first_to_last.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c5cad2e3-8afd-4bac-b1b7-3a8f64fc6b91/what_stocks_to_buy_now_motley_fool.pdfIn PDF document text
    • http://tuganireriwem.rf.gd/8624973498.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e968fb11-9734-44ac-88b6-67622cd3f7b1/paxewa.pdfIn PDF document text
    • http://kozitoxezafovi.rf.gd/platform_heels_shoes_silver.pdfIn PDF document text
    • https://2f60c0de-bae8-48d8-8f3f-ce7907f87c52.filesusr.com/ugd/badafb_8984d35933ef4271b7e569918f672816.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/80bea646-7fde-46f7-8f16-712d95bf41bf/psychology_in_modules_12th_edition_by_david_g._myers_c._nathan_dewall.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0a7f0f04-a51d-49fe-a4e6-d8c938a36d0c/dragon_coloring_pages_for_adults_free.pdfIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f0f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0F8 5496 bytes
SHA-256: 1ff4c53055f262fbd219b8cae0a21428189f13ad87e3b0084cdb2c185a8e6d09
font_01_sfnt_off00010391.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10391 11416 bytes
SHA-256: 1ee2c7602f7414b17f89d1059308890a9c7cb0c71fdcca678335a973aface9f3

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