Malicious PDF — malware analysis report

Static analysis result for SHA-256 f90c192317b857fa…

MALICIOUS

PDF

88.9 KB Created: 2021-04-04 12:47:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 3f897216c8e37247fc22805b9799c4b1 SHA-1: 4dcae28b481d67257fe3d7d967720053d60253aa SHA-256: f90c192317b857fa579f6b4cf3b633a12022cbea5b7ffdade122c9f6d04db5be
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm designed to redirect users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external URIs are indicative of a malicious document, possibly leveraging embedded JavaScript for redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://xezojetit.ru/strik?utm_term=how+to+write+a+children%2527s+book+step+by+step+pdf PDF link annotation
    • https://cdn.sqhk.co/devisofage/jzLJjix/zombie_apocalypse_2012_full_movie.pdfIn PDF document text
    • https://remewizefo.weebly.com/uploads/1/3/1/8/131856163/74433151f7.pdfIn PDF document text
    • https://kizekusoviwo.weebly.com/uploads/1/3/1/4/131453028/tegemakalejedoku.pdfIn PDF document text
    • http://tevaruv.sportsontheweb.net/how_to_get_a_international_driving_permit_for_japan.pdfIn PDF document text
    • https://mukoxorokote.weebly.com/uploads/1/3/4/5/134576398/fepifabaxatezax-zexurofobumad-mokeloboraj.pdfIn PDF document text
    • https://ganunosor.weebly.com/uploads/1/3/0/8/130814229/fcc0050c9bb33.pdfIn PDF document text
    • http://zonojebiridizo.mywebcommunity.org/pizza_bolis_menu.pdfIn PDF document text
    • https://vukuwapebu.weebly.com/uploads/1/3/5/3/135310377/daxisijeduguduv.pdfIn PDF document text
    • https://vidanametok.weebly.com/uploads/1/3/4/3/134318125/d4290ed35.pdfIn PDF document text
    • https://cdn.sqhk.co/gabogivoxavi/hahc2Z9/low_dose_lyrica_for_anxiety.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://d62ff7d9-aefc-4ab8-8cdf-af38868aea16.filesusr.com/ugd/54b9a1_9b41e50600d94194abeebe9af358c218.pdf?index=trueIn PDF document text
    • https://204833c8-abda-4421-8777-5048ee7dd919.filesusr.com/ugd/e30b7a_cfbef4da54984bdd9d894dd9826df16c.pdf?index=trueIn PDF document text
    • http://rulamiji.onlinewebshop.net/itunes_hip-hop_charts_albums.pdfIn PDF document text
    • https://8a6b9437-e7f2-49d7-8c24-351b272aa67a.filesusr.com/ugd/b18e4d_7595465a84ad4cd2b6aa03fb1cfc11a3.pdf?index=trueIn PDF document text
    • http://gafijid.atwebpages.com/83301669167.pdfIn PDF document text
    • https://14579757-8399-40ae-9aa0-1c510f02119b.filesusr.com/ugd/5613ee_2d556ff6fc9d49909e87206213c10092.pdf?index=trueIn PDF document text
    • https://013c3ecd-17dd-4738-ad87-554153c764a5.filesusr.com/ugd/36f25b_2342f4f0d565496fa38639efdc9d8dd6.pdf?index=trueIn 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_off00011d79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D79 5636 bytes
SHA-256: 41eeb2f2c81bbcbd38f7cbf3e17e626f6a3939a17afdc6508f0c18b5ec0ca861
font_01_sfnt_off000130ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130AD 11060 bytes
SHA-256: 7388957a67fd087f8d4aa93aa09f06b54459c65bbf7a3934efd0b153449472bc

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