Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e355c9a1f81156f…

MALICIOUS

PDF

66.9 KB Created: 2020-11-29 08:06:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 88853a3590ab89b0751dfee366cfab18 SHA-1: 1bb331e9158854cae0f660b4db3e62f0be0ea91c SHA-256: 3e355c9a1f81156f58c7140b0dda9d29161ea2a4d91318edbcc54d4384dcb558
214 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector. The presence of a link farm suggests an attempt to generate traffic or distribute malicious content. The ClamAV detection and ML classifier further support its malicious nature, indicating it's likely a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://cctraff.ru/123?utm_term=apk+like+mobdro
    • https://babikovinemixe.weebly.com/uploads/1/3/1/8/131856339/ziburuvoso.pdf
    • https://sotokogel.weebly.com/uploads/1/3/4/2/134266154/3172504.pdf
    • https://retujofidevi.weebly.com/uploads/1/3/4/6/134621577/kubiw.pdf
    • https://lubipufubuk.weebly.com/uploads/1/3/4/5/134597980/1969193.pdf
    • https://cdn-cms.f-static.net/uploads/4478393/normal_5fb84a467301c.pdf
    • https://cdn-cms.f-static.net/uploads/4464522/normal_5fb8a5adb4582.pdf
    • https://jikuwizavu.weebly.com/uploads/1/3/4/8/134873999/76933.pdf
    • https://cdn-cms.f-static.net/uploads/4474191/normal_5fb51effc60b8.pdf
    • https://jotitotibewava.weebly.com/uploads/1/3/1/3/131383271/3464558.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/b3f5eb34-df91-4b49-8094-6810bcb4e2f7/62089917257.pdf
    • https://uploads.strikinglycdn.com/files/2f94b747-266b-4187-98bc-04a0cc996f36/87559954774.pdf
    • https://uploads.strikinglycdn.com/files/614226a1-445c-4dc8-92dc-741a7c5d077b/haripath_baba_maharaj_satarkar_mp3_f.pdf
    • https://uploads.strikinglycdn.com/files/3b201d40-6263-4147-a82e-447ec66402f7/43744171864.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_off0000cada.bin
e4a11279d693144dc69e8d3f9604fa39492b6d8ad1a741117f3b78f0837c4254
pdf-font-stream PDF embedded font (sfnt) at offset 0xCADA 4908 bytes
font_01_sfnt_off0000db6e.bin
d7874c9bd7d0cc39cc4ed813dd0c828b9b07282ad9841401836e4a10c4742038
pdf-font-stream PDF embedded font (sfnt) at offset 0xDB6E 10432 bytes