Malicious PDF — malware analysis report

Static analysis result for SHA-256 352c8ad387e0fcdb…

MALICIOUS

PDF

61.5 KB Created: 2021-01-25 03:45:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 25cf12e13ce03c1075d3ab4625077e83 SHA-1: 83e9e7c913d34e8335b31bdf5ff2a82cab696e4e SHA-256: 352c8ad387e0fcdb4f70c62c195c90c00f94775de8db0e9bfb8b7cbbbe0d8ae5
214 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, identified as a link farm, directing users to potentially malicious websites such as 'crophysi.ru'. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the PDF structure itself facilitates the malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/123?utm_term=summer+waves+pool+parts+walmart In PDF document text
    • https://static.s123-cdn-static.com/uploads/4476941/normal_5ffe95856d4b4.pdfIn PDF document text
    • https://welavomuwaj.weebly.com/uploads/1/3/4/6/134633166/d5b1ad526c0.pdfIn PDF document text
    • https://fejiwapofiji.weebly.com/uploads/1/3/4/6/134699364/rikoxis.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495525/normal_5fd9183b3646d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4505837/normal_5ff04ca5d3a8f.pdfIn PDF document text
    • https://govonomuvilikiw.weebly.com/uploads/1/3/4/6/134620083/kafiwixerewasa_vawizin.pdfIn PDF document text
    • https://powotatetodo.weebly.com/uploads/1/3/0/7/130738650/vovewerenimunugo.pdfIn PDF document text
    • https://ziravejutit.weebly.com/uploads/1/3/0/7/130740001/dusajuzije.pdfIn PDF document text
    • https://sojagimizalafar.weebly.com/uploads/1/3/5/3/135317111/fa7378b973a60d1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366389/normal_5fe5d18728502.pdfIn PDF document text
    • https://juvuvekogowara.weebly.com/uploads/1/3/1/8/131856935/tasirokov-fufukamava.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/fisulefajow/fox_sports_channels_tv_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/rujabepifar/sogawuwodododetukan.pdfIn PDF document text
    • https://s3.amazonaws.com/jusuberu/91845093374.pdfIn PDF document text
    • https://s3.amazonaws.com/regufojalojaza/robbery_bob_apk_mod.pdfIn PDF document text
    • https://s3.amazonaws.com/jotogorurekuro/wigewopigiditisivalim.pdfIn PDF document text
    • https://s3.amazonaws.com/juzowilipi/ludesumavojuzobabubuzu.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b371.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB371 5220 bytes
SHA-256: f41ae4052aad358a737872dc12db0305b060694d15d16dc9d09a2ba729a69bff
font_01_sfnt_off0000c52c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC52C 10140 bytes
SHA-256: af333f2b38d716126e3dc0b97282bcd8ec2dbc907a2e50faeeaceafb8b1d9737

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