Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a4e2ee6249bff40…

MALICIOUS

PDF

70.5 KB Created: 2021-02-27 18:10:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 09800052acbbfbbd5418bc4f89e27331 SHA-1: c7a967f58185cf96d8c64c4ac570600cb4a73559 SHA-256: 4a4e2ee6249bff40723bed18c9fc6c73010df2b067b5bcc54e4d28135726dcc4
186 Risk Score

Malware Insights

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

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 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://fokemale.ru/strik?utm_term=how+great+thou+art+free+printable+lyrics PDF link annotation
    • https://dalideno.weebly.com/uploads/1/3/5/3/135384103/paxotob-desukinitugax-dezekorotoba-xonukexu.pdfIn PDF document text
    • https://zegikawa.weebly.com/uploads/1/3/4/6/134640481/tofivam_welojutadijukus_gojiluzi.pdfIn PDF document text
    • http://xozonline.ru/12450899163mi8vh.pdfIn PDF document text
    • https://pejegenipejixe.weebly.com/uploads/1/3/4/8/134848799/80d4f1d049b9.pdfIn PDF document text
    • http://teachost.com/color_palette_adobe_premierelsdk6.pdfIn PDF document text
    • https://pulufakifene.weebly.com/uploads/1/3/3/9/133999255/nesamawonufaw.pdfIn PDF document text
    • https://tatogupuragafa.weebly.com/uploads/1/3/4/0/134096405/gejamur-xipeg.pdfIn PDF document text
    • https://nemabofafuz.weebly.com/uploads/1/3/5/3/135389169/bakigo-rinafatoxameto-nalasokiviti-bolele.pdfIn PDF document text
    • http://fubawubu.22web.org/14880478987.pdfIn PDF document text
    • https://tebojejuket.weebly.com/uploads/1/3/4/7/134764489/tuxisubevatud_gososimom.pdfIn PDF document text
    • https://cdn.sqhk.co/gisepavuv/jiaia0r/48202288946.pdfIn PDF document text
    • https://taxudomajifi.weebly.com/uploads/1/3/4/1/134108655/fepoxurosolu.pdfIn PDF document text
    • http://leree6.club/cats_cradle_eiffel_towerkzcda.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vutekumini.epizy.com/acceptance_of_resignation_letter_format.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_off0000d93c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD93C 5572 bytes
SHA-256: 1391863363860aea808b05d6d232bef811de10ff8e24abf844ee10755e195471
font_01_sfnt_off0000ec44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC44 9444 bytes
SHA-256: 9acfde537fb6282458818a0c4b52e1bf88a83c5412509f0e1a61ee838738e7e0

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