Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5594469da4d7246…

MALICIOUS

PDF

80.6 KB Created: 2021-04-24 12:26:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 770f1a80d77a720f79c64aa05cdfc911 SHA-1: b610db8fd3304c5a3af08c22e594fe775f7908b3 SHA-256: d5594469da4d72465e2c873a5c60e56cd711f252b200704e4fe564f229598e4e
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the presence of numerous external URLs points towards a malicious document, likely a phishing lure or a method to distribute further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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
  • 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://pelibifir.ru/strik?utm_term=how+to+read+after+we+collided+online+free
    • https://dikubone.weebly.com/uploads/1/3/4/6/134603537/9a0d710.pdf
    • http://2220202.ru/97954568160p87bf.pdf
    • https://zalivibutadugaf.weebly.com/uploads/1/3/5/3/135391941/6724918e50.pdf
    • https://rinotawobuv.weebly.com/uploads/1/3/4/7/134768279/7165896.pdf
    • https://rikelakejif.weebly.com/uploads/1/3/4/8/134885243/mibujefomap_mejusop_xafenufisuzeg_vukojewimaj.pdf
    • https://cdn.sqhk.co/mepapogivoma/ezn2UlW/14738208633.pdf
    • http://ita-talia.fun/44389794272wldc3.pdf
    • https://pegepigav.weebly.com/uploads/1/3/4/4/134481067/xajelo.pdf
    • https://cdn.sqhk.co/jatizaru/Njjigjg/mass_car_bill_of_sale_template.pdf
    • https://bateworolod.weebly.com/uploads/1/3/4/3/134315912/0e8128862542850.pdf
    • https://vidajubobulixi.weebly.com/uploads/1/3/4/6/134650234/wasidamaxowokabi.pdf
    • http://sellamorem.com/fulemimud0zd7o.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://204833c8-abda-4421-8777-5048ee7dd919.filesusr.com/ugd/e30b7a_6beb8e3887574dbf9465df4c7b3565f4.pdf?index=true
    • https://fb413987-6e77-4bf1-aaa6-e97eb550fbee.filesusr.com/ugd/108936_40f51bb21f624d0bb0daa5bd1941066a.pdf?index=true
    • https://849bdae7-2456-4570-9e2a-fc769e7e49ad.filesusr.com/ugd/2074c9_7f2bd35f2fa54e3fb5713547813cbbf1.pdf?index=true
    • https://edb7bb8d-792a-4213-93ec-7f573d37cc74.filesusr.com/ugd/bfd504_68c0dd4cef5a4794a309a9c2df9d8f4d.pdf?index=true
    • https://f62823ea-e863-4eb7-bd7c-e3bac0139ff1.filesusr.com/ugd/8c639a_c6c200e92c744def9688dad019847c69.pdf?index=true
    • https://4db61c00-1078-4917-8a1c-a2c1480eb6e0.filesusr.com/ugd/c94206_2aa3a99686cb4f40bc702a623a9e955b.pdf?index=true
    • https://44bb6ee8-a0fe-4f72-890f-0f0a2fec05cf.filesusr.com/ugd/b65acf_56e8f9f7a6b144db99175d2ddb5767a6.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f2a6.bin
b2ea67ba51e32ee52e2610700df9e523a24d08db7f4645acafbea60ff180dc8c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF2A6 4676 bytes
font_01_sfnt_off0001029d.bin
e5ec2a3a0ccd657cdc8f8474ab1be543ada09072cf96d838079de1ae3f982b28		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1029D 10564 bytes
font_02_sfnt_off0001266a.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1266A 4324 bytes

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