Malicious PDF — malware analysis report

Static analysis result for SHA-256 34536276d961e297…

MALICIOUS

PDF

75.8 KB Created: 2021-01-22 22:53:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 09c756a573e04a851e737662a51d1cd7 SHA-1: d848bf074d4d4ddebf790b85f255d91508e38c61 SHA-256: 34536276d961e297144f798eae2a23fc5c8c483316d4fd96f9ed30b5ae256029
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, identified by the PDF_SEO_LINK_FARM heuristic, suggesting it is designed to direct users to potentially malicious content. The ClamAV detection and ML classifier also indicate malicious intent. The primary purpose appears to be acting as a link farm to distribute other malicious files or lead users to phishing sites.

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 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://trafffi.ru/aws?utm_term=jsw+deck+sheet+catalogue PDF link annotation
    • https://cdn.sqhk.co/difanemifal/j97jfia/17209929179.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447437/normal_5ffe06fa2a47e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470689/normal_5fcc9e0498f05.pdfIn PDF document text
    • https://cdn.sqhk.co/ranotigu/ejaqWMK/maxeju.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382779/normal_5fffac737587d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487416/normal_5fcebc9301d25.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370063/normal_5fd3474f94d78.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380413/normal_5fc85ddfecc38.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402252/normal_5ffd99b089363.pdfIn PDF document text
    • https://gerasulas.weebly.com/uploads/1/3/4/8/134861388/turalomosowivanumami.pdfIn PDF document text
    • https://cdn.sqhk.co/waxigapo/lrvjiha/atwoods_weekly_ads_and_sales.pdfIn PDF document text
    • https://cdn.sqhk.co/xolafunodo/gd6LicO/geometry_dash_2._2_beta_android.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414494/normal_5fe0ace250e77.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4405929/normal_5fce87148d900.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410206/normal_5fcbf94027030.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zisafaziga.epizy.com/college_algebra_for_dummies_cheat_sheet.pdfIn PDF document text
    • http://dinixebun.epizy.com/40644493181.pdfIn PDF document text
    • http://lepomosafajuki.rf.gd/maths_sums_for_class_6_with_answers.pdfIn PDF document text
    • http://lagefow.epizy.com/veviwelunikeno.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d680.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD680 5248 bytes
SHA-256: ebc9957005ac9571419380abd000aa894c99068f1c1479d3352d2a6bfbdbae3c
font_01_sfnt_off0000e870.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE870 10480 bytes
SHA-256: 0f1ea835e15a3e21048f7585e5484d14d0e282da6cc008f7686d6f2c86aadc08
font_02_sfnt_off00010c3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C3B 16140 bytes
SHA-256: 2732c78df68b4531e26da51a256f0f9ab881cb8a96d1886ade34872d88eeece3

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