Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0be4fb37dde18a7…

MALICIOUS

PDF

86.7 KB Created: 2021-02-23 10:46:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 8e0a42a1eac0cc4081f99a715bb14a9e SHA-1: abae78b54eab3c1b888a94037cebdb942bb75e24 SHA-256: c0be4fb37dde18a7755ea300dc81cae5821a6fc919c4c9e1ecd210f71f17e1e2
126 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to disposable domains and link farms, suggesting a phishing or malware distribution campaign. The presence of a URL with a 'utm_term' parameter further supports the idea of a targeted lure. No scripts were extracted from this sample, but the overall structure and URL distribution are indicative of a phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://seumenha.ru/strik?utm_term=5.+how+might+different+types+of+stressors+affect+your+health PDF link annotation
    • http://tofuvuniz.iblogger.org/86612171938.pdfIn PDF document text
    • https://biteledazuxol.weebly.com/uploads/1/3/4/3/134315761/namamug-lirewokaji.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448116/normal_601e5fc0de54f.pdfIn PDF document text
    • http://dexemipewuga.22web.org/nivedux.pdfIn PDF document text
    • https://nolujamikudaze.weebly.com/uploads/1/3/4/8/134868466/zevagiwe-bunibiziko-kanekimog.pdfIn PDF document text
    • https://cdn.sqhk.co/naxupowu/RBrQhbO/84559400302.pdfIn PDF document text
    • https://cdn.sqhk.co/rutunidosaw/jfjjahg/download_idle_tap_racing_mod_apk_android_1.pdfIn PDF document text
    • http://apsdd54gfv.xyz/coolrom_gba_romso4o5m.pdfIn PDF document text
    • https://cdn.sqhk.co/duvetezoje/idggNJu/3970187352.pdfIn PDF document text
    • http://zemimumaloger.iblogger.org/report_adverse_reaction_to_flu_shot.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388627/normal_5fe3e88799ad1.pdfIn PDF document text
    • http://mesretly.xyz/decodificador_de_7_segmentosf04zt.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lanoxitumamused.rf.gd/faxoladixumow.pdfIn PDF document text
    • http://bonizeza.epizy.com/ambient_night_sounds.pdfIn PDF document text
    • http://milifarininigo.rf.gd/bipap.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_off000111b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111B6 5824 bytes
SHA-256: 9dc9bc8a31c6ed1fdfc8add7fb5a7ce84b47fdb8d384f4efd3a1ed18aefe476a
font_01_sfnt_off00012586.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12586 11612 bytes
SHA-256: 15d3252a86017f11eae53546a5218432acd5d140d1f4aaedbd9d87a76f87f33d

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