Malicious PDF — malware analysis report

Static analysis result for SHA-256 70b87a474088dc05…

MALICIOUS

PDF

77.1 KB Created: 2021-03-26 06:48:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3c08522059dce7c25cffcedb22d842c5 SHA-1: 9a2f070718ed85ef92162469609d38e9fcb3802c SHA-256: 70b87a474088dc0503d066cea0be36a956a1509fe048e9b078da43197923990f
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, identified as a 'PDF_SEO_LINK_FARM' heuristic, with one prominent URL being https://xezojetit.ru/123?utm_term=vidmate++video+movies. ClamAV also detected this file as 'Pdf.Phishing.Trojan'. The presence of embedded URLs and the link farm structure strongly suggest a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://xezojetit.ru/123?utm_term=vidmate++video+movies
    • https://cdn-cms.f-static.net/uploads/4382960/normal_600de086be914.pdf
    • https://cdn-cms.f-static.net/uploads/4460060/normal_5fe90c49805cd.pdf
    • http://obsluzhivanie-kompyuterov.moscow/cuisinart_single_cup_coffee_maker_troubleshooting5o4kp.pdf
    • https://static.s123-cdn-static.com/uploads/4403937/normal_5ff40d14153b8.pdf
    • https://static.s123-cdn-static.com/uploads/4444117/normal_5ff4d74fbfc4d.pdf
    • http://it50disconto.pro/my_passport_wireless_pro_documentation4wuxh.pdf
    • https://cdn-cms.f-static.net/uploads/4387060/normal_604e91ec1280a.pdf
    • https://cdn-cms.f-static.net/uploads/4446280/normal_6049c46323c23.pdf
    • https://cdn-cms.f-static.net/uploads/4485436/normal_602788aa2e449.pdf
    • https://salufisudad.weebly.com/uploads/1/3/2/6/132695294/wuziv-mijiv.pdf
    • https://cdn-cms.f-static.net/uploads/4481673/normal_5fd1e248454c0.pdf
    • https://cdn-cms.f-static.net/uploads/4379719/normal_6051c22d3a625.pdf
    • https://gabofulonu.weebly.com/uploads/1/3/4/7/134730366/5126182.pdf
    • https://static.s123-cdn-static.com/uploads/4376127/normal_5fe178ce8ca4f.pdf
    • https://jigurojo.weebly.com/uploads/1/3/5/3/135321607/3631578.pdf
    • https://cdn-cms.f-static.net/uploads/4456676/normal_6017aacb61bb0.pdf
    • https://static.s123-cdn-static.com/uploads/4459188/normal_5fcb123535fd1.pdf
    • https://static.s123-cdn-static.com/uploads/4490274/normal_5fc95443a6afa.pdf
    • https://cdn-cms.f-static.net/uploads/4487432/normal_601f1d31a38c6.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/jasipefulaxiduj/kimaxogoxap.pdf
    • https://s3.amazonaws.com/wutogugej/zurobuvapitokuririli.pdf
    • https://s3.amazonaws.com/vojapu/biography_reading_comprehension_worksheet_2nd_grade.pdf
    • https://s3.amazonaws.com/biwubeleba/maxavasasejamokilekom.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_off0000f2a8.bin
0d979952a9348430807af3a1932c4dff5c707cd71766d2d3709fb8a103d3514b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF2A8 4868 bytes
font_01_sfnt_off00010328.bin
270557fe6b6be31bb6a8bf23a1ec58f252b84ceb62d6d9549c57a8fb831209ce		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10328 10484 bytes

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