Malicious PDF — malware analysis report

Static analysis result for SHA-256 443eae3f13a5b89e…

MALICIOUS

PDF

73.6 KB Created: 2020-11-24 18:40:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c2519feaaefc9b1e586f435945aef666 SHA-1: 1e2cd87d43b97ec8956939f1765d63371e3728ab SHA-256: 443eae3f13a5b89ea369db76d16a6be6b7a6b929765748b92a45acd5de1d6000
244 Risk Score

Malware Insights

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

This PDF document contains a large number of embedded links, many of which point to disposable hosting services and appear to be part of a link farm. One critical heuristic indicates a link to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the document's structure and embedded links are indicative of a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://traffmen.ru/123?utm_term=m-audio+keystation+61+mk3+manual+pdf
    • https://satupagewamikim.weebly.com/uploads/1/3/4/5/134584558/romuvubad.pdf
    • https://cdn-cms.f-static.net/uploads/4461766/normal_5fb27902d3998.pdf
    • https://kanexala.weebly.com/uploads/1/3/4/3/134374151/tatuzitetanolo.pdf
    • https://rijizego.weebly.com/uploads/1/3/0/7/130776487/samuwozasana.pdf
    • https://rimenedefogifu.weebly.com/uploads/1/3/4/4/134466040/f3e174e43.pdf
    • https://pemezexuz.weebly.com/uploads/1/3/4/5/134585882/letavala-nuwumuvupapepo-kekapudosik-zirelot.pdf
    • https://zejibafubetu.weebly.com/uploads/1/3/4/1/134108860/370f0a5807c.pdf
    • https://ditikoxariwifip.weebly.com/uploads/1/3/4/6/134636805/4aa897.pdf
    • https://zibabesisem.weebly.com/uploads/1/3/4/6/134670176/1510440.pdf
    • https://lasajiboz.weebly.com/uploads/1/3/1/3/131379041/1465200.pdf
    • https://cdn-cms.f-static.net/uploads/4419425/normal_5fb9988172222.pdf
    • https://lamosovi.weebly.com/uploads/1/3/4/6/134600354/6478723.pdf
    • https://tarebizadutobi.weebly.com/uploads/1/3/4/3/134310067/1854227.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/ef006d4d-c7e4-4068-b20f-0f2e723f0296/rutupidukesiluremo.pdf
    • https://uploads.strikinglycdn.com/files/65fc4430-5524-4f49-b369-48e82a0ccef5/74270992013.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cc0e.bin
6ffa623d57473c993a9c02c805dd1f5952db0453c9f4c140ad948f3e3d9a4643		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCC0E 5664 bytes
font_01_sfnt_off0000df75.bin
5e13e3b8bfe29d3f14f00e5abfd3caa80db66e347d60d72c4b24b160baba42b0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDF75 10356 bytes
font_02_sfnt_off00010330.bin
c71ad209d3f40f4afdf3b8818c0794654f9c838e4fd783bfde958e4624144c3c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10330 16240 bytes

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