Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2c7a31d2063f489…

MALICIOUS

PDF

77.9 KB Created: 2021-03-23 12:41:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 07b807c4f1a706c487fe5b30899eaf08 SHA-1: eed73446edca0dbcfc8e6c00b2e85f23102567d8 SHA-256: c2c7a31d2063f4892d8956e4bc2443e7c9971ccb4e07fa6733d0a3e576b6c19c
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with one specifically pointing to 'nipisod.ru/award', suggesting a phishing or malware distribution lure disguised as sheet music. The presence of external URIs and link farm heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://nipisod.ru/award?keyword=chicago+cell+block+tango+sheet+music+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4366371/normal_604f0f97449cf.pdfIn PDF document text
    • http://pro-gram.pro/57299507444wahb1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449769/normal_60452c5f87083.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455659/normal_602c30b308297.pdfIn PDF document text
    • http://wuvevaj.iblogger.org/tamil_news_paper_today.pdfIn PDF document text
    • http://nutigunejome.22web.org/vomekizizawelowej.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446761/normal_5ff78c6a6dc69.pdfIn PDF document text
    • http://itverys.space/1083877170oronv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4529024/normal_6010d68b7ed22.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427523/normal_6038d5c4b3205.pdfIn PDF document text
    • http://cashbackk.site/sutogebotiforoneiw29.pdfIn PDF document text
    • http://abwaab.su/rejirevoxiligik450s.pdfIn PDF document text
    • http://japadeja.22web.org/wopisiwinojeredut.pdfIn PDF document text
    • http://academic-club.ru/63183875370mcsp6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418175/normal_605703eb1ce1f.pdfIn PDF document text
    • http://nubolutlion.xyz/benomulujadoguzuzugevugqgw7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4472488/normal_5fffcb7a2409a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wesukudepabu.epizy.com/my_sunshine_4sh.pdfIn PDF document text
    • http://fefomuk.epizy.com/tujiwadikotirivatuz.pdfIn PDF document text
    • http://xesoxudonututad.rf.gd/91391905963.pdfIn PDF document text
    • http://walaveb.rf.gd/xosefulolulagerapijojes.pdfIn PDF document text
    • http://nareboveridur.epizy.com/fiwipebozisujej.pdfIn PDF document text
    • http://mojogisi.epizy.com/mutunowozuwapibiloz.pdfIn PDF document text
    • http://lotawovuvowuk.rf.gd/biolite_sunlight.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_off0000f067.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF067 5580 bytes
SHA-256: 4b9e083674cb6733237277face17003c819cd11c3e8b8231be5638b7d679e741
font_01_sfnt_off00010338.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10338 11624 bytes
SHA-256: 077e0871add998743441c835b17221eae19447d02e43aa9371e157ecf768e82e

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