Malicious PDF — malware analysis report

Static analysis result for SHA-256 79f00524aebe1ba1…

MALICIOUS

PDF

89.6 KB Created: 2021-03-31 07:46:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 389740e4b510f7ed20f39809f8b3dbf6 SHA-1: ce0e746ba57034dcf6196e7300b32c7c16e7ca1a SHA-256: 79f00524aebe1ba19bf8bd856dc1034b6ca8bda0694e2ca70514c467cc6c4019
186 Risk Score

Malware Insights

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

The PDF file was identified as malicious by a ML classifier and ClamAV, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation scheme. One of the embedded URLs, 'https://zajinet.ru/award?keyword=fluvial+processes+and+landforms+pdf', is particularly suspicious and likely serves as a lure or redirect to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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
  • 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://zajinet.ru/award?keyword=fluvial+processes+and+landforms+pdf PDF link annotation
    • https://taxudomajifi.weebly.com/uploads/1/3/4/1/134108655/jubomawubon.pdfIn PDF document text
    • https://motovonesavot.weebly.com/uploads/1/3/4/6/134690882/gopikezesugo-xupiki-wikamem-wuximupebituza.pdfIn PDF document text
    • https://dovekawelefirim.weebly.com/uploads/1/3/4/2/134266448/4280943.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384160/normal_603e9102eb579.pdfIn PDF document text
    • https://jupavovol.weebly.com/uploads/1/3/4/3/134314217/xusufisovudit.pdfIn PDF document text
    • https://dolunejasuvufa.weebly.com/uploads/1/3/0/7/130776008/056903951df2d.pdfIn PDF document text
    • https://molawaxurot.weebly.com/uploads/1/3/4/6/134699933/9aa18213f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471106/normal_5fe91fae97685.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/8fa88453-cf76-4ec2-955a-19fc271b1c6e/is_ryobi_tools_any_good.pdfIn PDF document text
    • https://d525ee04-2a40-494f-8ba9-fee52f7b18ee.filesusr.com/ugd/8b8e24_949ea5825d454c9dbd9794069c40b422.pdf?index=trueIn PDF document text
    • https://f07eb630-23ff-4298-a1df-d7940f1ba2dc.filesusr.com/ugd/097a5b_c3af2b9f095746c3adc14b770b47042f.pdf?index=trueIn PDF document text
    • https://5b2b9875-3923-4577-9ef6-0527498c95e7.filesusr.com/ugd/4e6dd5_3a529f4326474fb9a9bdee28cd7f5ed0.pdf?index=trueIn PDF document text
    • https://c7972686-9310-4d97-8ac3-15e828887225.filesusr.com/ugd/8a419d_8e8d193effd74c00adf45e22d76abd35.pdf?index=trueIn PDF document text
    • https://30621b86-6952-4b41-80af-4d24d830bc7c.filesusr.com/ugd/122077_f075f59d785c469aac2455e7d13d42ff.pdf?index=trueIn PDF document text
    • https://8641c524-1fb5-4292-87ed-dd72f64d6c22.filesusr.com/ugd/9b7d8a_2f62689131ba488f816202a450011e21.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc926e93-4e89-42c9-923a-636f293190cc/what_is_a_transcendentalists_view_of_god.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010d1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D1C 5316 bytes
SHA-256: ac0ad674c1c46e3746a1627875310fd809201150da98654003ca1cff3830abcd
font_01_sfnt_off00011f2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F2A 10684 bytes
SHA-256: 6fc3c79b120fa9a8825ed5d194e2d32b44c907a0d6c60dfd49271f073998db09
font_02_sfnt_off000143fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143FB 16204 bytes
SHA-256: a95eff378c135b1ab40d10b3cd1da1bafbc07f86005f57898d079c90d712ddbd