Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e38bc3f92e8a919…

MALICIOUS

PDF

74.7 KB Created: 2021-05-31 12:00:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 3036dce8f14e6e8aee99d8abf1d7d29c SHA-1: 21e97df34ca80c0ceb4b15e4719aea2136479838 SHA-256: 0e38bc3f92e8a919529814851fdf76d0783f51ab7756654f48d86b5a025ee767
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, characteristic of a link farm designed to direct users to potentially malicious websites. Heuristics indicate it's a disposable link farm, and ClamAV detected it as a phishing trojan. The embedded URLs, such as https://nipisod.ru/strik?utm_term=gerhard+kittel+theological+dictionary+of+the+new+testament+pdf, are likely used to distribute further malicious content or lead to phishing pages.

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://nipisod.ru/strik?utm_term=gerhard+kittel+theological+dictionary+of+the+new+testament+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4380522/normal_6062f2690deb0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425772/normal_603681a270df4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421776/normal_603262aad6958.pdfIn PDF document text
    • https://xezamojukugenu.weebly.com/uploads/1/3/5/3/135316948/litesemaxo_dawezewawa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457876/normal_5fcf0d0387fd7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501479/normal_60111ab0292a1.pdfIn PDF document text
    • https://mujavipaw.weebly.com/uploads/1/3/0/8/130874121/zabudanovadufuz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380214/normal_600feb0d256bf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366055/normal_600a50592a118.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420588/normal_5ff8ca5d45fda.pdfIn PDF document text
    • https://tedaliduvif.weebly.com/uploads/1/3/5/9/135957254/577677.pdfIn PDF document text
    • https://ruzabipisoxo.weebly.com/uploads/1/3/4/5/134528447/e19f4.pdfIn PDF document text
    • https://mixozanuzobese.weebly.com/uploads/1/3/5/4/135400893/38e383131c5eb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377909/normal_601e82a852494.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403270/normal_6068ccf238552.pdfIn PDF document text
    • https://zefemebok.weebly.com/uploads/1/3/0/7/130775969/dutafirunabew.pdfIn PDF document text
    • https://wosiwimobej.weebly.com/uploads/1/3/1/1/131164223/e32206.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4499999/normal_6007fc7d58e28.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375694/normal_5fe645b9dd858.pdfIn PDF document text
    • https://todegebonuvakef.weebly.com/uploads/1/3/1/6/131606144/sujat.pdfIn PDF document text
    • https://bugupogif.weebly.com/uploads/1/3/4/7/134766918/belejijofoluzin-daxipukuxe-rurafimijega.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474759/normal_602706f9179b4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000e26b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE26B 5860 bytes
SHA-256: 423e693c9d8e8395b1a6c60b99fbea3384adaa852667a71358b469218b7ac65b
font_01_sfnt_off0000f654.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF654 11408 bytes
SHA-256: 3abb8d844b3ec7054d42c1131a11d7cf9cdc22c72d81e594e30e49ddf61b869b