Malicious PDF — malware analysis report

Static analysis result for SHA-256 178197ed5e524d2c…

MALICIOUS

PDF

77.1 KB Created: 2021-03-18 07:43:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 3f4d525d45ee3c1e7452cf6fd3beb633 SHA-1: 491372e74ea43ef9dcd5f773b7cdc8459a3dc628 SHA-256: 178197ed5e524d2c3db66a7d5dfaebd409fdd5672ef6accbe53d2c8f60a34ca4
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicative of a link farm. ClamAV and ML classifiers strongly suggest malicious intent, specifically phishing. The embedded URLs, such as 'https://xezojetit.ru/award?keyword=scratch+cards+pdf', are likely used to redirect users to malicious or SEO-manipulated content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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 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.
  • 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://xezojetit.ru/award?keyword=scratch+cards+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4486356/normal_5ff4687b24c2d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389104/normal_604acab24b3b2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494681/normal_6013cbd425ab8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444098/normal_602b521fc827c.pdfIn PDF document text
    • http://mofawab.66ghz.com/types_of_refractive_error.pdfIn PDF document text
    • https://xorewodanuvidiw.weebly.com/uploads/1/3/1/3/131381095/juvilamax_rorif.pdfIn PDF document text
    • https://tezimapegimera.weebly.com/uploads/1/3/0/9/130968984/5101080.pdfIn PDF document text
    • https://runufegoxow.weebly.com/uploads/1/3/5/3/135347372/fikuleviderotu.pdfIn PDF document text
    • https://dufubixapitosig.weebly.com/uploads/1/3/4/5/134503348/raxoviziz.pdfIn PDF document text
    • https://xobojurum.weebly.com/uploads/1/3/4/5/134599739/mekitekenopokadex.pdfIn PDF document text
    • https://nelunozulugekis.weebly.com/uploads/1/3/0/7/130739970/1709871.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389358/normal_604e72dfba718.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/divelatoxa/46044212666.pdfIn PDF document text
    • https://s3.amazonaws.com/sizadagazagaj/wimaxujoxuv.pdfIn PDF document text
    • https://s3.amazonaws.com/fidefofudi/49759985021.pdfIn PDF document text
    • https://98e80eac-0673-4bf9-a3de-4132461903b3.filesusr.com/ugd/1acd69_7e0da55a81e74556b410492237d86f3e.pdf?index=trueIn PDF document text
    • https://74fc1a11-d445-4ffb-bc6b-7a79e5a65a18.filesusr.com/ugd/097bd5_c9e969983f124aae95303702eb6cd3cb.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fidefofudi/afzelia_africana.pdfIn PDF document text
    • https://s3.amazonaws.com/tufitijinexu/86481866042.pdfIn PDF document text
    • https://e9542b43-fb79-4c62-94a9-c66526381fce.filesusr.com/ugd/4142f3_4d8a9dab29014aab9986082d96ee050e.pdf?index=trueIn PDF document text
    • http://lopusasiloxoka.epizy.com/20250823549.pdfIn PDF document text
    • https://1ba6f066-89d4-4445-b8a9-08a6de046ef2.filesusr.com/ugd/d40554_c0b642472235475abf98929ad8746c87.pdf?index=trueIn 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_off0000f1b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1B8 5316 bytes
SHA-256: 39ab1d2aa9ca4c1e52f3f695fc88e4a6ec96a8e3687805515a17b68499efdf2e
font_01_sfnt_off000103c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103C6 10776 bytes
SHA-256: 2d9028c870fd0aa88ec7b0fc8edc6627c7202ff66e538b1fdaec6cbb9b9b28d5