Malicious PDF — malware analysis report

Static analysis result for SHA-256 0aff0c38ba74d117…

MALICIOUS

PDF

85.3 KB Created: 2021-03-18 18:29:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3283013ae6e90e33aee9a6740af80446 SHA-1: 7aafb5c10458450d5eab4191180bc2d5eaf52e1c SHA-256: 0aff0c38ba74d1178e0a78a83f4ac3fe781c227e429114c514d73144825ca3c9
186 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO poisoning tactic. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external URIs point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://gimoguvi.ru/strik?utm_term=how+to+do+a+paper+in+chicago+style
    • http://wisitens.online/acura_rdx_radio_code_error_2el320.pdf
    • http://petersikdar.com/woboxutubexemiguxugobx759g.pdf
    • https://static.s123-cdn-static.com/uploads/4382952/normal_5ff678542b0af.pdf
    • https://nemabofafuz.weebly.com/uploads/1/3/5/3/135389169/dajar.pdf
    • https://widoripitobagat.weebly.com/uploads/1/3/4/8/134882637/13f34f.pdf
    • https://cdn.sqhk.co/lixejudazeza/gU0gfhd/wuwewupoxasu.pdf
    • http://juwakola.iblogger.org/angular_download_file_from_server.pdf
    • http://jevufoduxixan.22web.org/36469007100.pdf
    • http://krokoboko6.xyz/24553785331icuws.pdf
    • https://lenololiwi.weebly.com/uploads/1/3/4/4/134455370/d3fbf13e.pdf
    • http://frontglass.xyz/14367168494sln4p.pdf
    • https://static.s123-cdn-static.com/uploads/4470016/normal_5fcb03ceaee0d.pdf
    • https://cdn-cms.f-static.net/uploads/4366665/normal_600a650073c23.pdf
    • https://cdn.sqhk.co/kunimoxifagi/gKfaBct/93526996962.pdf
    • https://cdn-cms.f-static.net/uploads/4461204/normal_602777a965c8b.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://kujinid.rf.gd/manik_2005_bengali_full_movie_free.pdf
    • https://2a6c20f5-091f-48b5-a5be-bf749919b1f6.filesusr.com/ugd/3794ad_070a8564b70d4855b2b1e5a0da9326ca.pdf?index=true
    • https://952d9f4b-853a-4e85-af28-23c4d489d487.filesusr.com/ugd/8db125_b8da6a53bba945b3a9c36e7d2ed938de.pdf?index=true
    • https://f62823ea-e863-4eb7-bd7c-e3bac0139ff1.filesusr.com/ugd/8c639a_b484307f546f4bff9eed3f9ea0090c7e.pdf?index=true
    • https://8ac5c8e1-9174-427d-95c2-90bebb9f105a.filesusr.com/ugd/44b221_b282055588f24718b296e5264f13352e.pdf?index=true
    • http://dokajita.rf.gd/kujabonojepeje.pdf
    • https://f59c0a4d-c104-43ac-8966-a5978cdf1b8c.filesusr.com/ugd/0c1ebd_75ac43dfd93b414e9c4972b1174aeba8.pdf?index=true
    • 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_off00010d0e.bin
f913db50571f7c2c6cb15308b322a3da8735cd154400d52e156c0b211ef5331b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10D0E 5488 bytes
font_01_sfnt_off00011fcb.bin
ce94a0e0c9a4cdf5bcaf1676b5ed4f9bb313fbd305e2f99b4e5ca78124801e3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11FCB 11720 bytes

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