Malicious PDF — malware analysis report

Static analysis result for SHA-256 643ecef536f40f4c…

MALICIOUS

PDF

71.4 KB Created: 2021-01-25 08:15:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: af854886e56056f10a1a9c0c825f23a2 SHA-1: 88b5f400b3c94c0fde3161dbca394253fa0fbdfc SHA-256: 643ecef536f40f4cbd16c7bf78abec29cef733f68fa0424dea6344226f43a2c9
126 Risk Score

Malware Insights

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

The PDF contains multiple external URIs, with one specifically identified as a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were extracted, the presence of numerous URLs and the heuristic firings point towards a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://traffset.ru/123?utm_term=instructional+design+strategies+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4410199/normal_600005399032b.pdfIn PDF document text
    • http://rutekotugu.22web.org/cid_all_episodes_list.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475397/normal_5fd70fbd25761.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4458829/normal_60048aadf05c3.pdfIn PDF document text
    • http://contact-git.top/73203992200b3gqf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404757/normal_5fd728278e2a0.pdfIn PDF document text
    • https://dojoxokixen.weebly.com/uploads/1/3/4/8/134878929/5626fef493b0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367287/normal_5fe534f4e257b.pdfIn PDF document text
    • http://formblckr1.xyz/958246605163cwm6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475861/normal_600751ad915e2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kalilom.epizy.com/hammerwatch_survival_mode_guide.pdfIn PDF document text
    • http://jibogifimot.epizy.com/honorbound_rep_guide.pdfIn PDF document text
    • http://kafopazam.epizy.com/vababigunubupuworifam.pdfIn PDF document text
    • http://pagupim.epizy.com/wti_crude_oil_storage_report.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_off0000da3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA3B 5260 bytes
SHA-256: 885e5ee66eaf357fdce0577971248cf3425bae846d2c385a42c56d667f833714
font_01_sfnt_off0000ec30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC30 10616 bytes
SHA-256: 99d10e7f9b82c9b3a4bf56d74905b1549a42b8fc6682a06da96e61982dfa7613

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