Malicious PDF — malware analysis report

Static analysis result for SHA-256 b36c79bafbf0b06e…

MALICIOUS

PDF

68.1 KB Created: 2020-11-29 14:23:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 55e45c07509d4d0a59bcce350303da1a SHA-1: 992f50fa4f7f231b32563891b36134e4b16030e6 SHA-256: b36c79bafbf0b06e54b5d092b7716e1de8c5acdfb6ded2d37aee0e2645994b0b
244 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and a machine learning classifier. It contains a large number of links, many pointing to disposable domains, suggesting a link farm or SEO manipulation tactic. One critical heuristic indicates a link to known malicious redirector infrastructure, specifically 'https://traffking.ru/aws?utm_term=estimating+decimals+worksheets+for+grade+6'. The presence of numerous PDF links and the redirection to potentially harmful sites indicates an attempt to lead the user to malicious content or phishing pages.

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://traffking.ru/aws?utm_term=estimating+decimals+worksheets+for+grade+6 In PDF document text
    • https://xedaliwim.weebly.com/uploads/1/3/1/4/131454603/kesevavapevuzotowi.pdfIn PDF document text
    • https://digonowokeke.weebly.com/uploads/1/3/1/8/131856318/53425fc8f80e.pdfIn PDF document text
    • https://jujodupif.weebly.com/uploads/1/3/2/3/132303189/f44c66139b74813.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412774/normal_5fbd7715a87d8.pdfIn PDF document text
    • https://xojerajap.weebly.com/uploads/1/3/1/3/131384359/juvuxisodo.pdfIn PDF document text
    • https://bufemiwod.weebly.com/uploads/1/3/4/8/134846302/2694439.pdfIn PDF document text
    • https://zoseruvabu.weebly.com/uploads/1/3/4/4/134492528/pudubeve-ninojizuvabat-fiwazire-xunokerid.pdfIn PDF document text
    • https://guzavubovusev.weebly.com/uploads/1/3/4/6/134659469/b57511de33c23.pdfIn PDF document text
    • https://jawemojope.weebly.com/uploads/1/3/4/3/134399256/c0267c4b56dc4f.pdfIn PDF document text
    • https://naxulukituno.weebly.com/uploads/1/3/4/8/134879135/3936498.pdfIn PDF document text
    • https://jawowigo.weebly.com/uploads/1/3/0/7/130774982/xovaragimogerem.pdfIn PDF document text
    • https://vamewufu.weebly.com/uploads/1/3/4/3/134317042/01f8b6da547.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/degisapemifa/gupenutolomepajawupuxubof.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_off0000cb94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB94 5700 bytes
SHA-256: 3a5527b08acf2ecd5b16a19bb4371930e6507527ecb95f215b6082d728801506
font_01_sfnt_off0000dee8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEE8 11128 bytes
SHA-256: dfc329dda7a0cc072b189094c8a69faca5aa37e0d14f17cd9ed9ff0d6f41ef35

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