Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa1aa116ab034eaa…

MALICIOUS

PDF

77.2 KB Created: 2021-04-19 11:50:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: c4799b0882afac714d0ba6b5ee8253c5 SHA-1: 18301716cdcffe707d421c336effca6e777ccce5 SHA-256: fa1aa116ab034eaa7efb2543a76a4901692c8011c0d3f058df83a6412e74e3b4
186 Risk Score

Malware Insights

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

This PDF file is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous external URLs, with at least one pointing to a suspicious domain ('kuzutuzo.ru'). The heuristic 'PDF_SEO_LINK_FARM' indicates a high volume of external links, suggesting an attempt to manipulate search engine results or distribute malicious content. No scripts were extracted, but the sheer number of outbound links points to a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://kuzutuzo.ru/strik?utm_term=sentence+structure+examples PDF link annotation
    • https://safuziketuxoxu.weebly.com/uploads/1/3/0/8/130814855/virula-razogut-palosuso-rojegaworudeko.pdfIn PDF document text
    • https://nabinavupofi.weebly.com/uploads/1/3/5/3/135350319/5482173.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421957/normal_606dff1135202.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473322/normal_600d336bb79b8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459796/normal_5fe530d69f99c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374956/normal_601db96accb7a.pdfIn PDF document text
    • https://lufuneliza.weebly.com/uploads/1/3/2/6/132682735/9831866.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383791/normal_603e251d46d8f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413714/normal_6067d63a25039.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366957/normal_601f0e3d8e2ac.pdfIn PDF document text
    • https://sedemosifov.weebly.com/uploads/1/3/0/8/130874126/5660721.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4405208/normal_5fcd369fef32c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379987/normal_6064d36430f3d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://832c8a8d-f05d-46e3-9166-97d9de82ace4.filesusr.com/ugd/432509_5190733778e04497b716600b0407e702.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zulezov/gareduwulifojilitisis.pdfIn PDF document text
    • https://9c43cb74-45e3-47de-9527-fda2e8336169.filesusr.com/ugd/af0aa9_0ae3c902cc32492283a9c404a1b49731.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/de21db00-0e74-4967-a854-9431b1229bcc/convert_to_jpg_macbook.pdfIn PDF document text
    • https://148d48ef-a78d-4e34-a4d2-755cfbac042a.filesusr.com/ugd/ccca9b_982b12d820a54ba4a3d45791ea508e49.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vipuxafol/fitebeserogobufopelo.pdfIn PDF document text
    • https://s3.amazonaws.com/dewazewokib/tiwimususinasimomo.pdfIn PDF document text
    • https://0eb00d84-361a-45dc-b346-1af5c8eb785c.filesusr.com/ugd/d79848_f480713d9da04f76bb9f441995cc7aa5.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9fc4ea6e-cbfc-48a5-a039-9632ed372cb0/25885418171.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b1c27289-fa9a-42a1-a323-6b497bc311a8/what_are_the_benefits_of_keeping_pets_essay.pdfIn PDF document text
    • https://b1706aec-e9b1-4c6c-9a93-f14ef4a1c402.filesusr.com/ugd/3b47cb_07e35bfa92e248cf80b6b6da64efad60.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/79748150-7a1d-4e9b-90bb-cdd92e040547/wewitumaduvaxir.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c2c2bca1-75c8-4db5-9e0f-85cc1cf2765a/what_is_the_smallest_chromosome.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f17c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF17C 5252 bytes
SHA-256: 2114dda39158c75bcd8b25c172ee6f95b526216ce6be87c2117a05eabe0eb8a1
font_01_sfnt_off00010345.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10345 10388 bytes
SHA-256: 2b76ac329db91ae9a84c46a38c98223c65a9932341122723d2bfc8b48b5ce9e5

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