Malicious PDF — malware analysis report

Static analysis result for SHA-256 160c0a8402ff7e92…

MALICIOUS

PDF

74.5 KB Created: 2021-03-23 17:58:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e5d2ecebfc97d09127ea63f2c2a0a258 SHA-1: e7a607f1064d20b9c702c3b08158009937bb2360 SHA-256: 160c0a8402ff7e925a8c5ca34b4fd80c6dc05ac1c47d37e0aa661449088f3da9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, identified by the 'PDF_SEO_LINK_FARM' heuristic, suggesting a malicious intent to redirect users. ClamAV detection and ML classification further support its malicious nature. The presence of numerous external URLs indicates a potential phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://golowaki.ru/123?utm_term=logstash+output+elasticsearch+template+example
    • http://rudovatimokasum.medianewsonline.com/baby_nursery_checklist.pdf
    • https://cdn-cms.f-static.net/uploads/4409103/normal_6047df1a9ea3b.pdf
    • http://mamefumiwuto.mywebcommunity.org/celebrate_recovery_inventory_worksheet_printable.pdf
    • https://tutuludoj.weebly.com/uploads/1/3/0/8/130874598/vugubi.pdf
    • https://gubaxuxozixiviw.weebly.com/uploads/1/3/1/3/131383744/6adf53905f13.pdf
    • https://jezelide.weebly.com/uploads/1/3/0/8/130874318/lapodasosupek.pdf
    • https://static.s123-cdn-static.com/uploads/4390999/normal_5fc7acc3e328a.pdf
    • https://kaxamutibe.weebly.com/uploads/1/3/5/3/135348628/rowuxobapo-jukoliz.pdf
    • https://cdn-cms.f-static.net/uploads/4483365/normal_604d78c829988.pdf
    • http://pirunumilusarib.sportsontheweb.net/binary_numbers.pdf
    • https://static.s123-cdn-static.com/uploads/4409616/normal_5ffdfc2b99d4e.pdf
    • https://static.s123-cdn-static.com/uploads/4403259/normal_5fcbb2bf4fd25.pdf
    • https://cdn-cms.f-static.net/uploads/4481161/normal_604898c471e57.pdf
    • https://cdn-cms.f-static.net/uploads/4479441/normal_5fdb9412acad3.pdf
    • https://static.s123-cdn-static.com/uploads/4465386/normal_5feda52ab47b4.pdf
    • https://cdn-cms.f-static.net/uploads/4408176/normal_5fe626848244c.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://37bdae34-bb2f-403f-997c-54a7c09d9c06.filesusr.com/ugd/dc98cc_ac5d5c4a92c844e4803cf05ce1ffd0cb.pdf?index=true
    • https://f8ba888e-8f71-4fde-8303-550399648f4e.filesusr.com/ugd/17ce20_80bc9f22f560420097f8f0c4f9fe0722.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_off0000e3bf.bin
726bee6fb3e4c203cb20f6a5da3c73b181c86c2a67445641a9903ca32fa9d10c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE3BF 5356 bytes
font_01_sfnt_off0000f5da.bin
e3d755aa1abe606d0c981f786cbea4aeb6279e12d65b381c82b3d74b2164e5b1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF5DA 11400 bytes

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