Malicious PDF — malware analysis report

Static analysis result for SHA-256 a66413471372dbc1…

MALICIOUS

PDF

69.1 KB Created: 2021-01-20 08:45:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 1771892c9e11b9a0e20d651e51488a50 SHA-1: 8419c494f24b1add6696d3d80facaef8dc9c3f30 SHA-256: a66413471372dbc10bcf064d6180ad9fc1f944929dc163e8a7bf7dcc542000ff
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable hosting domains, as indicated by the PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics. The ML classifier and ClamAV also flagged this file as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The primary attack pattern appears to be a link farm designed to manipulate search engine results or direct users to potentially malicious content hosted on domains like 'kalogoraretupo.epizy.com'. No scripts were extracted, but the presence of numerous external links suggests a phishing or SEO poisoning attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://bologen.ru/123?utm_term=mongoose+schema+array+of+object+ids PDF link annotation
    • https://site-1254761.mozfiles.com/files/1254761/94493572695.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369331/normal_5f94d983b8b5c.pdfIn PDF document text
    • https://bokosemebejira.weebly.com/uploads/1/3/0/8/130813317/6d812744496.pdfIn PDF document text
    • http://dulexip.22web.org/94367643199.pdfIn PDF document text
    • https://jotinebemoti.weebly.com/uploads/1/3/4/6/134681432/torekuxemow.pdfIn PDF document text
    • https://site-1194674.mozfiles.com/files/1194674/four_lines_worksheet.pdfIn PDF document text
    • https://fupefodomixeja.weebly.com/uploads/1/3/4/8/134889506/c5dd0cdd2f0b.pdfIn PDF document text
    • https://tuxuboninivufos.weebly.com/uploads/1/3/4/4/134478209/vokodudogezaburidas.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463275/normal_5faaae6818ab3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422133/normal_5fef82898a5c0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384459/normal_5fcd7006a0088.pdfIn PDF document text
    • https://site-1197344.mozfiles.com/files/1197344/fusizimunepid.pdfIn PDF document text
    • https://puzagejezazi.weebly.com/uploads/1/3/4/4/134465952/525dd59b.pdfIn PDF document text
    • https://valezofijamope.weebly.com/uploads/1/3/4/4/134445284/xuzusug_xegobabonavel_xefis.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kalogoraretupo.epizy.com/argo_movie_kickass.pdfIn PDF document text
    • http://gisunomadipoxas.epizy.com/rokodorararuvuneke.pdfIn PDF document text
    • http://metologedafux.epizy.com/bell_bottom_movie_songs.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_off0000ceee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEEE 5728 bytes
SHA-256: 3a9b351d2e072fa5458ffea24b3d908ab0ee35349345c72f5ee2054856897ca4
font_01_sfnt_off0000e25b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE25B 10728 bytes
SHA-256: d379e7650035a11ad83f6d0f91a71558a599ee72fa3a17b54dd631ac718a5480

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