Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ba7d3549bc3c1d4…

MALICIOUS

PDF

69.1 KB Created: 2021-03-23 11:07:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d8ba7f607145b10d91684650d051ad79 SHA-1: 9d851e1cb90c7e2c5992bfa80bab81321abf3122 SHA-256: 9ba7d3549bc3c1d485035c44894ed87b7b5f416d4a1bc1068da20614a24bf502
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, a common tactic for link farms and phishing. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically a phishing or trojan distribution campaign. The embedded URLs, such as https://midufefew.ru/strik?utm_term=bosch+nexxt+premium+washer+won%2527t+drain, are likely used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://midufefew.ru/strik?utm_term=bosch+nexxt+premium+washer+won%2527t+drain
    • https://static.s123-cdn-static.com/uploads/4494451/normal_5fe02a3b2c047.pdf
    • https://static.s123-cdn-static.com/uploads/4379486/normal_5ffc1bb10f3fb.pdf
    • https://static.s123-cdn-static.com/uploads/4489414/normal_5fc68cfe19bb0.pdf
    • https://cdn-cms.f-static.net/uploads/4366965/normal_6032dc94e6c20.pdf
    • https://cdn-cms.f-static.net/uploads/4393019/normal_6011fbe45723c.pdf
    • https://cdn-cms.f-static.net/uploads/4389830/normal_6043680720d84.pdf
    • https://cdn-cms.f-static.net/uploads/4365649/normal_604d2fd49ca5f.pdf
    • https://static.s123-cdn-static.com/uploads/4374532/normal_5fc6ff1f3ff5e.pdf
    • https://static.s123-cdn-static.com/uploads/4526930/normal_5ff51f1b12ea1.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://0dd0cd87-80d3-4eb5-b9c6-73c43c3a6fca.filesusr.com/ugd/f0b6b3_1fdcb90605084833b806b57952542840.pdf?index=true
    • http://zobugut.epizy.com/sejimoradonu.pdf
    • https://b18ac5c8-c825-4c59-a0a1-290c879ce4f6.filesusr.com/ugd/1a0fde_a200bd4f39a9419dacd8d417266092a7.pdf?index=true
    • https://fc060a1e-8c1d-4b7d-bafd-75f79d4c6355.filesusr.com/ugd/c0a468_a7b891f2d1944a6a8a5c62a664cac4a9.pdf?index=true
    • http://sinalowus.epizy.com/team_trivia_answer_of_the_day_michigan.pdf
    • https://667abc8f-92ca-45d9-bc9d-789c80a68858.filesusr.com/ugd/dcd78f_779eabf4247349a4851f87502f95e5d2.pdf?index=true
    • https://3ae4d138-4ba3-4962-98fb-1b98b40a6a82.filesusr.com/ugd/38062a_bdf7ed26d93d4c67a160feea7bb3ac0a.pdf?index=true
    • https://bf23b77b-49a9-4bef-a898-a03cfb94aefa.filesusr.com/ugd/134172_60a1c7d3ee0d423abd8955f3e6cf3b85.pdf?index=true
    • https://bf23b77b-49a9-4bef-a898-a03cfb94aefa.filesusr.com/ugd/134172_7c7ccef73d5d406db4bbc21592b8130f.pdf?index=true
    • https://uploads.strikinglycdn.com/files/9e3896af-3d1a-452f-bf0f-a9dd1a4e1616/jibabokumozomitujudimipig.pdf
    • http://mizujem.epizy.com/54641485728.pdf
    • https://uploads.strikinglycdn.com/files/df8f1902-526d-424b-903f-7611d27218c5/is_korean_banana_milk_healthy.pdf
    • https://uploads.strikinglycdn.com/files/85d474b5-291a-4a2d-885e-8a9a4d17c8fa/33089179414.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d014.bin
0b3071099d879572cc2799bc79fe7fd198252a883393da122126f43245296463		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD014 5524 bytes
font_01_sfnt_off0000e2d4.bin
217d58399a4557bd0d0e0faccac10fe93adf3875d0e6b9a22eeba40cd2f173d4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE2D4 10388 bytes

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