PDF malware analysis — malicious · c7318693194de74a

MALICIOUS

PDF

87.9 KB Created: 2021-06-12 01:11:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27

MD5: 0b92c3645460233326b9005e578a4830 SHA-1: 40d90ba5d2a6ba417dbafd14d3d3a80efbbf263f SHA-256: c7318693194de74a57b2da4df6950899307614e9b8b42e697362c42743f856dc

126 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs, with a high-confidence heuristic identifying it as a link farm on disposable hosting. One of the primary URLs, `https://crewmak.ru/pbw?utm_term=goblin+shaman+d%2526d`, is likely the intended destination for malicious activity.

Machine Learning

Nyx PDF Classifier malicious score 0.9995

Heuristics 5

ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
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://crewmak.ru/pbw?utm_term=goblin+shaman+d%2526d PDF link annotation
- https://fexolemigelewi.weebly.com/uploads/1/3/4/2/134235379/1449206.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4492240/normal_5fd70442ee725.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4448724/normal_5fd7af39633ab.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4444386/normal_6042f5e244dd8.pdfIn PDF document text
- https://jafoxoxuxovawe.weebly.com/uploads/1/3/0/8/130813536/maguj.pdfIn PDF document text
- https://mikezibe.weebly.com/uploads/1/3/1/4/131453119/d2d79970b2339.pdfIn PDF document text
- https://bulasenojagaroj.weebly.com/uploads/1/3/4/3/134357248/caec7c956144.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4382627/normal_6032386308b19.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4413982/normal_606d51c9a206c.pdfIn PDF document text
- http://www.ascendercorp.com/In PDF document text
- http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
- https://uploads.strikinglycdn.com/files/75b595ea-a6fd-418f-a149-85d8ee7c52a6/55339863538.pdfIn PDF document text
- http://fulusivijomu.pbworks.com/f/19111614778.pdfIn PDF document text
- http://wenuveraroto.pbworks.com/w/file/fetch/144714783/how_do_you_pronounce_draco_malfoys_dads_name.pdfIn PDF document text
- http://vibevekofano.pbworks.com/w/file/fetch/144655581/89561572823.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/556c9373-e9a2-4e3a-8935-31af96f766b8/68097094727.pdfIn PDF document text
- http://togiwuvoze.pbworks.com/w/file/fetch/144468522/sabumuxojawekofiraret.pdfIn PDF document text
- http://lifevuve.pbworks.com/w/file/fetch/144945171/gepox.pdfIn PDF document text
- http://wejojixi.pbworks.com/f/66019736823.pdfIn PDF document text
- http://lezakoliz.pbworks.com/w/file/fetch/144719970/29771786325.pdfIn PDF document text
- http://xemeganavon.pbworks.com/f/the_most_expensive_hotel_in_nigeria_2021.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/74600ac0-629c-4973-9547-4ee69538dcef/10649545644.pdfIn PDF document text
- http://noxiwako.pbworks.com/w/file/fetch/144525672/como_construir_un_asador_de_carne_de_ladrillo.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
- http://dejavu.sourceforge.netIn PDF document text
- http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off000103ce.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x103CE	5140 bytes
SHA-256: `5562fc2535453070f05c0df9ec152e23a41d61594c4febe2abaf6bdd4c421879`
`font_01_sfnt_off0001151e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1151E	11652 bytes
SHA-256: `3c3d892ae1723ecf0567417a94b48cd2aa6bfce237d073bcdad931fcc7df4c31`
`font_02_sfnt_off00013d09.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13D09	16140 bytes
SHA-256: `00468df452218f546d59995a7cf9b4297092e2fd476dbd2f6ce79846bd051107`

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