Malicious PDF — malware analysis report

Static analysis result for SHA-256 c64aaf8dd5965804…

MALICIOUS

PDF

79.5 KB Created: 2021-05-15 13:17:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 759d982986327b691cc6807a6e24453d SHA-1: 39f8d7b8187f599e6783df3a7dae129c48423111 SHA-256: c64aaf8dd5965804307e9cd886b52f00778e3fc3f3386bc4ae345500148cfc3a
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and numerous external URLs point towards an attempt to redirect users to potentially harmful content.

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://midufefew.ru/strik?utm_term=2003+f250+6.0+injector+rebuild+kit
    • http://loneresel.mygamesonline.org/48728196069.pdf
    • http://polobasopika.mywebcommunity.org/2603581804.pdf
    • https://votopugukoz.weebly.com/uploads/1/3/5/3/135315446/xofewibu_mugixosezutesil.pdf
    • https://madigapelodawip.weebly.com/uploads/1/3/4/8/134846312/611c52f01dfe1.pdf
    • https://cdn.sqhk.co/dewozoju/iPKpc4q/99815447878.pdf
    • http://gepexoliv.medianewsonline.com/76035156448.pdf
    • https://cdn.sqhk.co/tejosepu/hgTa0ii/pickaxe_frenzy_tournament_rewards.pdf
    • https://tiwilofudux.weebly.com/uploads/1/3/1/6/131606348/bopenutezeketi-ravikadazubal.pdf
    • https://cdn.sqhk.co/sazalevimit/zie4VHP/99602331570.pdf
    • https://cdn.sqhk.co/sawitofi/HihhcIj/red_blue_mixed_balls_puzzle.pdf
    • http://midakurapujif.mypressonline.com/dojodegojepozadiwuwuxifip.pdf
    • https://texifafotolatip.weebly.com/uploads/1/3/4/7/134764930/pogeran.pdf
    • https://pudisemibupar.weebly.com/uploads/1/3/4/0/134096773/morejikalawewukoz.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://kojuvurapamox.myartsonline.com/nizidozepumudibuz.pdf
    • https://95a83a18-022f-4aa5-9dc2-588eac4c5c4a.filesusr.com/ugd/ccb6ab_82f536cd944147109dcb46611c60a875.pdf?index=true
    • https://b00f38ea-0d13-4519-ab0f-1253f0d03ca0.filesusr.com/ugd/289c5e_0238d74a3b5147dba0c77cf1cab0ff37.pdf?index=true
    • https://s3.amazonaws.com/firigugixujotov/formative_assessment_word_meaning.pdf
    • https://s3.amazonaws.com/neviwove/bhoot_fm_29_june_2018.pdf
    • https://979cd01f-16ea-4d2c-b189-234964c95597.filesusr.com/ugd/d4c4cf_859c519e4fed4a60a2112cfbf38d4cd3.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_off0000f605.bin
81b94aab69fd799d522e2b66d9f9c739aae8ef67817710886cde5bc852ef6f1a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF605 5560 bytes
font_01_sfnt_off0001090e.bin
97d81606535aec94053dab1b85f23e62223ecbcb5529bf6ad5cfe2d614d0b24e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1090E 11044 bytes

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