Malicious PDF — malware analysis report

Static analysis result for SHA-256 902edf45fbc3c0d5…

MALICIOUS

PDF

83.8 KB Created: 2021-06-03 00:05:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d162d8d203d587b1c56a2bb1fb37cb81 SHA-1: 085547cb51e47b884be90c7a47f28d8c2c8c5a59 SHA-256: 902edf45fbc3c0d584f04d6a6c77640ac10e1cce780107235b354c419c1b8347
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated a high probability of maliciousness. The presence of a large number of external links, including the primary URL 'https://krisoc.ru/pbw?utm_term=wolfteam+kurt+hilesi+nas%25C4%25B1l+indirilir', suggests a link farm or phishing attempt. While no scripts were directly extracted, the PDF structure and heuristic firings point towards a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://krisoc.ru/pbw?utm_term=wolfteam+kurt+hilesi+nas%25C4%25B1l+indirilir
    • https://barezixajeg.weebly.com/uploads/1/3/4/3/134318527/381615.pdf
    • https://static.s123-cdn-static.com/uploads/4530712/normal_5ff6204a45728.pdf
    • https://puzaloraren.weebly.com/uploads/1/3/4/5/134510283/besumakibe-nusej-nepevivid-gipivutenoxa.pdf
    • https://cdn-cms.f-static.net/uploads/4375698/normal_5fd2c17dcdb55.pdf
    • https://cdn-cms.f-static.net/uploads/4417140/normal_60642bfc80c13.pdf
    • https://cdn-cms.f-static.net/uploads/4382966/normal_605827a2789df.pdf
    • https://jiditejebata.weebly.com/uploads/1/3/5/3/135305220/mokufokenuwosi-jiraxud.pdf
    • https://kofuremejekesor.weebly.com/uploads/1/3/4/2/134235353/sadikedevifafavebe.pdf
    • https://pusojavinobaz.weebly.com/uploads/1/3/4/3/134353251/1869644.pdf
    • https://cdn-cms.f-static.net/uploads/4475571/normal_5fda4dcaa5f96.pdf
    • https://turazuxutanuv.weebly.com/uploads/1/3/1/6/131606798/xazinuwen.pdf
    • https://bidubemawekewar.weebly.com/uploads/1/3/0/8/130815124/29d35be.pdf
    • https://wafukereloxajof.weebly.com/uploads/1/3/5/3/135311523/dffb32aeb.pdf
    • https://vifoxofanope.weebly.com/uploads/1/3/4/6/134670603/4190803.pdf
    • https://zojegidaluvimov.weebly.com/uploads/1/3/4/1/134109086/vexevidunox.pdf
    • https://binenivav.weebly.com/uploads/1/3/4/5/134516867/fe387.pdf
    • https://cdn-cms.f-static.net/uploads/4476768/normal_603beaba69c94.pdf
    • https://cdn-cms.f-static.net/uploads/4403533/normal_60600290a4c07.pdf
    • https://cdn-cms.f-static.net/uploads/4502248/normal_6037226c7370b.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://pusavivo.pbworks.com/w/file/fetch/144477249/56972752807.pdf
    • http://sipibujewadu.pbworks.com/w/file/fetch/144514074/dell_optiplex_9020_micro_service_manual.pdf
    • http://dawijunegolo.pbworks.com/w/file/fetch/144421476/auto_insurance_quote_comparison_excel_template.pdf
    • http://ziriwuru.pbworks.com/f/voyages_in_english_grade_4.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f784.bin
29016827632a309bb965896b235097a466291807539098665d82ea9fc79604f2
pdf-font-stream PDF embedded font (sfnt) at offset 0xF784 5136 bytes
font_01_sfnt_off000108e1.bin
06feb24d13a272f7b87765774bb6174c70c7a054abbe109290b4a8afe59d3a9c
pdf-font-stream PDF embedded font (sfnt) at offset 0x108E1 13060 bytes
font_02_sfnt_off0001315a.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3
pdf-font-stream PDF embedded font (sfnt) at offset 0x1315A 4324 bytes