Malicious PDF — malware analysis report

Static analysis result for SHA-256 8724430757ccc6e4…

MALICIOUS

PDF

78.7 KB Created: 2021-04-07 23:24:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c0dbd958d06f1a96fa96fe96b90799a1 SHA-1: eaf8909fdb23342c6376122e46e07d8e8021f753 SHA-256: 8724430757ccc6e4fb3698182f5777a8ef9aff4ee8a6df4023585fbd90c9b059
186 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many of which are hosted on disposable domains or link farms, indicating a likely SEO spam or phishing campaign. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body, though heavily obfuscated, appears to be related to skincare, which is likely a lure to disguise the malicious nature of the links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://leonvi.ru/strik?utm_term=how+to+get+rid+of+red+pimple+spots
    • http://robinmani.site/lagugupunirudazujimiwoniv34k5d.pdf
    • https://xeludopoveju.weebly.com/uploads/1/3/4/5/134528604/8fb44ad45.pdf
    • https://kutawujotin.weebly.com/uploads/1/3/4/0/134016956/popeluw.pdf
    • https://zaluvunikuf.weebly.com/uploads/1/3/1/0/131070459/neropa.pdf
    • https://nakalefa.weebly.com/uploads/1/3/4/5/134522788/894ab7a.pdf
    • https://sunutefe.weebly.com/uploads/1/3/5/3/135350425/6696938.pdf
    • https://kixodebu.weebly.com/uploads/1/3/2/6/132682063/bukazut.pdf
    • http://soldonlakewood.com/limibumv4q.pdf
    • https://suxifobafip.weebly.com/uploads/1/3/4/3/134370270/4111452.pdf
    • https://gutamunimidujad.weebly.com/uploads/1/3/4/6/134667749/3379256.pdf
    • https://widegavadiwudux.weebly.com/uploads/1/3/5/3/135325068/1368175.pdf
    • http://kijubol.iblogger.org/35169479149.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://5e9816b5-e261-4a84-a5c7-594b6999e1c8.filesusr.com/ugd/eb2f7d_6ec86be35e404494bf1bf2fe8f0fdf4e.pdf?index=true
    • http://matasup.rf.gd/marathon_watch_manual.pdf
    • https://d3dd75b0-514a-4dbf-a1f7-973a5b421fb1.filesusr.com/ugd/5b46ec_ea792ae8817b4ac59b7dee54bcac609e.pdf?index=true
    • https://7e073981-ad1c-4081-8dc0-76946ba36063.filesusr.com/ugd/c4f63d_a05eab971bdc41498fd4a80dccc0da27.pdf?index=true
    • https://dca540c6-954d-4243-9f09-0921753db957.filesusr.com/ugd/974a4e_f347153e346d4c76a9340073e6ef6e1a.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_off0000f592.bin
a5808680ef95c98ad74b97168711af39b71377e3b674159876e261b6ea89c3e6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF592 5204 bytes
font_01_sfnt_off0001074e.bin
526b89162096f00fed6b206866d4322ab3cc692c7fae1acf11eaa9faa9c9ea79		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1074E 10944 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.