Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e471988ce20de2a…

MALICIOUS

PDF

62.5 KB Created: 2020-11-28 06:03:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 504859b0723a41cdb3c8f3b66bc1fb48 SHA-1: 21e9b0f2e69ee30c832b3741dbdc1f68751db2fb SHA-256: 7e471988ce20de2a07f1cf6178ef17064b46d9452ace16fb2f154def428533e0
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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. Specific URLs and indicators for this sample are listed in the indicators section.

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://traffking.ru/strik?utm_term=chemical+bonding+worksheet+answer+key PDF link annotation
    • https://bedizegoresupa.weebly.com/uploads/1/3/1/3/131379398/dekegu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416940/normal_5f9c9b458b7bd.pdfIn PDF document text
    • https://fafofezun.weebly.com/uploads/1/3/4/3/134338513/nakipigakazus-xufozafi-gafigotuk-fuxojo.pdfIn PDF document text
    • https://dirigesibujov.weebly.com/uploads/1/3/0/9/130969991/mejurilulomipupudu.pdfIn PDF document text
    • https://tiwefosorusaduk.weebly.com/uploads/1/3/4/7/134715639/c625d94.pdfIn PDF document text
    • https://gulesome.weebly.com/uploads/1/3/4/4/134496781/tajibuda.pdfIn PDF document text
    • https://sojagifuwolu.weebly.com/uploads/1/3/4/6/134689160/lijarijeda.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376866/normal_5f9594801d59c.pdfIn PDF document text
    • https://newejata.weebly.com/uploads/1/3/3/9/133999860/367727.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/wutogugej/little_endian_and_big_endian_format.pdfIn PDF document text
    • https://s3.amazonaws.com/bubeto/barron_s_sat_biology_4th_edition.pdfIn PDF document text
    • https://s3.amazonaws.com/mijedusovineti/82262549447.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_off0000b934.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB934 5656 bytes
SHA-256: d73104fc57296e3f338107a0e3c9f067e1160718d7d51be2ba61e189cc000495
font_01_sfnt_off0000cc54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC54 9656 bytes
SHA-256: f8ef78e57a6b249c2cec4a37d054da7885304c0887e18e07e724059181adb2cd

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