Malicious PDF — malware analysis report

Static analysis result for SHA-256 34a39fcc96c2f81a…

MALICIOUS

PDF

76.2 KB Created: 2020-12-09 23:57:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 430f7d8a5ecd67fb41c92cd2ef559d11 SHA-1: 5a012ec18267607be2b4d82a0ef03558a9b8cdae SHA-256: 34a39fcc96c2f81a979afd73446f0056c7ed86128befaa54650b6499cd6db74d
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://ggtraff.ru/123?utm_term=cuisinart+custom+14+food+processor+walmart In PDF document text
    • https://cdn-cms.f-static.net/uploads/4376125/normal_5f8d7238b8872.pdfIn PDF document text
    • https://fuwewarudizikip.weebly.com/uploads/1/3/4/6/134644733/2082354.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410975/normal_5f9bda9f04783.pdfIn PDF document text
    • https://supidopize.weebly.com/uploads/1/3/4/5/134521205/94da9236644.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388062/normal_5fa294b75ee52.pdfIn PDF document text
    • https://xemakoxen.weebly.com/uploads/1/3/4/3/134320116/nizififotufewi.pdfIn PDF document text
    • https://nixuxani.weebly.com/uploads/1/3/4/4/134433038/8f6ae5181c.pdfIn PDF document text
    • https://vepezifu.weebly.com/uploads/1/3/4/2/134265798/kezofupuguvokag.pdfIn PDF document text
    • https://mulovepo.weebly.com/uploads/1/3/4/6/134666579/56a4e31dfc.pdfIn PDF document text
    • https://mosozedap.weebly.com/uploads/1/3/1/8/131856454/1ea76e5f4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420237/normal_5fa080266914b.pdfIn PDF document text
    • https://lewimovi.weebly.com/uploads/1/3/4/3/134311482/xeravilowowema-fabujopulake-natafowetoweva-pajowabatapid.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/rawesaragegugar/eulogy_for_a_veteran_poem.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_off0000d823.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD823 5436 bytes
SHA-256: 922b266322fba6c9abe9677a1e1e39b5fe48cdfd1c942b2d867b12b0c0ef2c58
font_01_sfnt_off0000eaa3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAA3 10632 bytes
SHA-256: d94aef71f5e267c50d90171e20372872c39b6c2cd9c5dbe9a80f78d74699315b
font_02_sfnt_off00010efe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EFE 16028 bytes
SHA-256: 13adf508137d8c465935a7a142060f5d940462760dc3fd3f5061e956d2f2222b

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