Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3fe4236efb11b87…

MALICIOUS

PDF

93.7 KB Created: 2021-01-16 11:33:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 4d664b67cd784fd3ef9f3ccb9927ec89 SHA-1: 0b94056f65e467b0807c57d2122c0fd6f06af0e3 SHA-256: c3fe4236efb11b87e970396f59a201c9bd2748d6d8980d562adc388fccb2dd1f
244 Risk Score

Malware Insights

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

This PDF file contains a large number of embedded links pointing to external PDF files hosted on various disposable domains. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' indicates that at least one of these links directs to known malicious redirector infrastructure. The ML classifier and ClamAV also flagged this file as malicious, suggesting it is part of a phishing or SEO spam campaign. No scripts were extracted, but the primary attack pattern involves redirecting users to potentially harmful content.

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
  • 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 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.
  • 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/aws?utm_term=admin+template+bootstrap+4+free+2018 In PDF document text
    • https://lefusavuforuv.weebly.com/uploads/1/3/4/4/134490278/bupanafizapafek-vafori-midiwiburozoki-rutexit.pdfIn PDF document text
    • https://site-1168049.mozfiles.com/files/1168049/xiradixegapumijolu.pdfIn PDF document text
    • https://site-1177025.mozfiles.com/files/1177025/spinning_shirts_for_sale_near_me.pdfIn PDF document text
    • https://site-1177829.mozfiles.com/files/1177829/51043953997.pdfIn PDF document text
    • https://xijoxamapapi.weebly.com/uploads/1/3/4/3/134337958/jekitedifugizomep.pdfIn PDF document text
    • https://tafibukazun.weebly.com/uploads/1/3/5/4/135400045/2576471.pdfIn PDF document text
    • https://semopadilined.weebly.com/uploads/1/3/4/6/134696525/jegaduwebape.pdfIn PDF document text
    • https://rixafewokeget.weebly.com/uploads/1/3/0/7/130739987/2329313.pdfIn PDF document text
    • https://site-1177860.mozfiles.com/files/1177860/21293427740.pdfIn PDF document text
    • https://kogezuzoxato.weebly.com/uploads/1/3/1/0/131070880/lamiroz.pdfIn PDF document text
    • https://duzigavejad.weebly.com/uploads/1/3/4/5/134513143/xivegupovopufu_denibujuw_kiwini.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/lupebesu/46374588081.pdfIn PDF document text
    • https://s3.amazonaws.com/firigugixujotov/63015134365.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_off000130f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130F5 5924 bytes
SHA-256: d3f19e51ff97d347cafb93e133a93403f2c5d9da2b7d7217f092cfcceea7840a
font_01_sfnt_off00014505.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14505 10744 bytes
SHA-256: 9c1923431523a6a2a60a6226d801a4d31720767aede93a534c1846e30eaac269

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