Malicious PDF — malware analysis report

Static analysis result for SHA-256 57dd7ab8e20a989e…

MALICIOUS

PDF

77.9 KB Created: 2021-04-08 04:00:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0f5c0e98181b0479bcebfe8a5d7d719a SHA-1: dda3ac0acbb823d7561ef8de4b004f5ed5d482c9 SHA-256: 57dd7ab8e20a989e64612489ad2ec021df5b18e70401f401eccb1153c95564c9
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, suggesting a link farm designed to direct users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as Pdf.Phishing.Trojan. The embedded URLs, such as https://jumiwimov.ru/strik, are likely used to deliver the final payload or redirect users to phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://jumiwimov.ru/strik?utm_term=disable+auto+shut+off+heating+pad
    • https://fewefemuge.weebly.com/uploads/1/3/4/3/134372507/d82e0c48db09a.pdf
    • https://zimuvudiredefux.weebly.com/uploads/1/3/2/7/132710782/2015710.pdf
    • https://bojubuloxobepi.weebly.com/uploads/1/3/0/9/130969884/filetutonop.pdf
    • https://sefaxamijewosaw.weebly.com/uploads/1/3/2/6/132682716/xobusanidifusu.pdf
    • https://static.s123-cdn-static.com/uploads/4443809/normal_5ff89936cd179.pdf
    • https://cdn-cms.f-static.net/uploads/4387565/normal_6050ec88c8ef0.pdf
    • https://tujeliwavujojow.weebly.com/uploads/1/3/5/3/135304707/f924bc22.pdf
    • http://remoliwagofaju.mywebcommunity.org/40220469579.pdf
    • https://witabavuwimob.weebly.com/uploads/1/3/4/3/134339013/731058.pdf
    • https://puwowuxavuz.weebly.com/uploads/1/3/2/6/132682233/kakosipedek.pdf
    • https://static.s123-cdn-static.com/uploads/4386606/normal_5ff4306c790d9.pdf
    • http://fobativ.mywebcommunity.org/marlin_22_rifle_model_60_stainless.pdf
    • https://cdn-cms.f-static.net/uploads/4380230/normal_605aafce4a30e.pdf
    • https://static.s123-cdn-static.com/uploads/4465249/normal_5fe20d4a784e9.pdf
    • http://boguzimaro.getenjoyment.net/basic_electronics_short_questions_and_answers.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/bejeseja/real_analysis_a_long-form_mathematics_textbook_jay_cummings.pdf
    • https://ff8eac81-0dee-4da4-b7c1-1dee070544a7.filesusr.com/ugd/2637cf_1e9041c39f8048d28b969fc2276195cc.pdf?index=true
    • https://5b0e1d79-1acc-45ba-a965-31015372eee8.filesusr.com/ugd/67f5f7_8272d77ed5d5481a89ceb59442b6ee9c.pdf?index=true
    • https://8a5a474a-a671-4857-921d-d1df0ee72544.filesusr.com/ugd/523716_a771079f640249c39b1085dd218b0698.pdf?index=true
    • https://s3.amazonaws.com/loranoduzuja/sintering_dry_reforming_of_methane.pdf
    • https://5e1449e8-5ae4-4a15-bc7a-ee23795bc964.filesusr.com/ugd/3a34a5_7b46055536fc4ba3af896e1454bd7b14.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_off0000e6ea.bin
28579c288bacbc26e82eea23cc4d9d0a55b20e7ab7bfb2d082633c8cadea3ed8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE6EA 5228 bytes
font_01_sfnt_off0000f8a2.bin
de1a1c49ab47d7641748339113fb5a3e2a8e7c48e036af3fe4fbfd6de7a06903		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF8A2 10392 bytes
font_02_sfnt_off00011c2c.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11C2C 4324 bytes

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