Malicious PDF — malware analysis report

Static analysis result for SHA-256 9890996c56e19917…

MALICIOUS

PDF

69.3 KB Created: 2021-02-14 01:25:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 5bebfb5af57081798a7b4f749cfe4a35 SHA-1: 51ff4ff9cfc15cda77099c15395f8e7986d45147 SHA-256: 9890996c56e19917711c444e302815ee3a2bec2339f321967f2c26adcfc7f77b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many pointing to free hosting services, indicative of a link farm designed to distribute malicious content or engage in SEO spam. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution via these links. No scripts were extracted, but the PDF structure itself is weaponized to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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.
  • 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://bologen.ru/wix?keyword=pathfinder+feat+trees PDF link annotation
    • https://bosonelete.weebly.com/uploads/1/3/0/8/130873804/nafowurararaxa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374376/normal_5fed712a70bfd.pdfIn PDF document text
    • https://lizitizesibegip.weebly.com/uploads/1/3/4/6/134685526/mizagamifesogib_kugufusatif.pdfIn PDF document text
    • https://bireguvax.weebly.com/uploads/1/3/0/7/130775683/poruroxewog_wedexizoz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427293/normal_5fcf929455fbc.pdfIn PDF document text
    • https://cdn.sqhk.co/podogule/bieiiib/bomb_suit_manufacturers_canada.pdfIn PDF document text
    • http://rutopadazemed.22web.org/wordpress_blog_page_template.pdfIn PDF document text
    • http://fortuneocredit.com/void_pyramid_wikinpz2w.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477369/normal_600494d8cb957.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450048/normal_5fddbccc5a23b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445125/normal_5fe571414568b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fofilelajisemap.rf.gd/lenovo_thinkpad_x1_yoga_spec_sheet.pdfIn PDF document text
    • http://sevuvev.epizy.com/polopuvopu.pdfIn PDF document text
    • http://xuvunemomot.epizy.com/26811268383.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_off0000d571.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD571 4964 bytes
SHA-256: 05245e3f608c3c63ff988b5692fd8d3fd98eaf042fbf6ad6a5ec67d4fc7449c2
font_01_sfnt_off0000e651.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE651 10032 bytes
SHA-256: 67454e83ab44a3e152ae667384bfd5fa79d287604d96f407d7666cb11774ca50

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