Malicious PDF — malware analysis report

Static analysis result for SHA-256 c65b9306416dc819…

MALICIOUS

PDF

83.1 KB Created: 2021-03-30 02:17:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fa7f89dd3e75efe01a2231ea3e2802a9 SHA-1: 2191e71a890f89e5465ff16ce4f617ffbfa9255c SHA-256: c65b9306416dc81972cd6373ee60169502bca738d7babd585d744889d935db9e
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 pointing to disposable domains, indicating a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were extracted, the PDF structure and numerous external URLs are indicative of a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://kuzutuzo.ru/wix?keyword=metal+detecting+regulations+arkansas
    • http://joy-todays.online/40813522954ds5i7.pdf
    • http://jojidasusesot.sportsontheweb.net/building_construction_civil_engineering.pdf
    • http://choosemadam.site/wilton_tip_2110_how_to_use6ng3x.pdf
    • http://mnatural.space/texozamhky4p.pdf
    • http://reduslimitalia-official.site/nuzomamotivuva0xlz1.pdf
    • http://unlockdeals.shop/wagner_w500_power_painter_manual9v0wa.pdf
    • http://rte-ita.fun/dazigexrg82f.pdf
    • http://kino-vezde.ru/828774004122aajw.pdf
    • http://ladiluvame.mypressonline.com/fanadugowawowul.pdf
    • http://raisinshq.pro/74423166722j7lr5.pdf
    • http://vknacruckalaikov123.xyz/pijasewuliroguxefajuk92c2.pdf
    • http://edayafar.xyz/diono_car_seat_radian_rxt_rear_facing3zcm6.pdf
    • https://logikepuni.weebly.com/uploads/1/3/4/4/134459966/gopexutorozakilok.pdf
    • http://olipaka.xyz/98869375897l3jzz.pdf
    • http://potenciy.xyz/dafobirokitetapimixuluw8p370.pdf
    • https://dubuweni.weebly.com/uploads/1/3/1/6/131637072/c0dabed7.pdf
    • https://bujefodamefizup.weebly.com/uploads/1/3/1/0/131070612/6791250921ac7a.pdf
    • https://gawujura.weebly.com/uploads/1/3/5/3/135325150/dakojuno.pdf
    • https://vozosirebuvova.weebly.com/uploads/1/3/1/3/131382942/dutev.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://0f0532cb-4478-41f9-91a1-cf277c4732ec.filesusr.com/ugd/8acad3_62b50408e1f945e1a96d240362ffb252.pdf?index=true
    • https://f7f2eb1f-4ce6-40bf-b337-6bcc2c9c1a95.filesusr.com/ugd/dc6899_334011eb084849e6b9ca17ed71f254ad.pdf?index=true
    • http://romofimor.onlinewebshop.net/79293720941.pdf
    • http://rexefobixavater.myartsonline.com/stalingrad_antony_beevor.pdf
    • https://d6aab468-caab-4d9e-910f-d3bf64ae4104.filesusr.com/ugd/5438e3_0c8c84dd412046b0a3aaf4fe1f8fa6fd.pdf?index=true
    • http://riveminigokoxa.myartsonline.com/muliperumapos.pdf
    • 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_off00010218.bin
8108421a8fac8c0d47d3fb5322ea373b9dd7977431d6bd7eadae2deb088b5d6b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10218 5176 bytes
font_01_sfnt_off000113d1.bin
a923823b32debb587c2e69cddf8d27b826cd79d871a917ea63cc8e71c1a4e66f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x113D1 12004 bytes

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