Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d0fe068c6524ce7…

MALICIOUS

PDF

82.2 KB Created: 2021-04-09 03:58:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 2b385c67879026301e627449e0f6ebdb SHA-1: 95f5d397ed1336be4ca0e4fca4c035c26d7f2ee3 SHA-256: 8d0fe068c6524ce77bda9da9268f9ffe80ad9a90aa7ef5ecfa59ede96792d119
186 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, many pointing to disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of embedded URLs and the heuristic 'PDF_SEO_LINK_FARM' point towards an attempt to manipulate search engine results or direct users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://midufefew.ru/strik?utm_term=learn+python+free+class PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4369304/normal_60186d9766590.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470017/normal_6000d416959f8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367921/normal_605bf1ef7137d.pdfIn PDF document text
    • https://tezagezowuvese.weebly.com/uploads/1/3/0/7/130775310/1008247.pdfIn PDF document text
    • https://nugukijozagesek.weebly.com/uploads/1/3/0/7/130739433/1715492.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457592/normal_6031313c50b1d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445557/normal_604751810a217.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445754/normal_604500e575275.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412606/normal_60393a15a65c6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367268/normal_5fe81c6d480c5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444630/normal_606e1d5146148.pdfIn PDF document text
    • https://naforuzutexas.weebly.com/uploads/1/3/1/4/131438024/5f2486d46efa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411708/normal_5fd38524b8876.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404529/normal_6050fb8f6f0eb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407994/normal_6036f7f665330.pdfIn PDF document text
    • https://wosutazewaxutu.weebly.com/uploads/1/3/0/7/130775331/478d45d8f9f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481056/normal_5ff0f3984375e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366628/normal_60036be73f2ed.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/e0f4cce7-923d-4a9a-a256-0ce963f4a698/govukepagotamox.pdfIn PDF document text
    • https://s3.amazonaws.com/pirosisob/kuxenilijeg.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f1fa668e-f572-4d52-bd47-c539856664e4/vigipedapenixala.pdfIn PDF document text
    • https://s3.amazonaws.com/vobuturinivi/79175000348.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1daccb6f-ac3e-4573-9c0e-a6710bac246f/mademigumimelifarawikadin.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_off0001039c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1039C 5144 bytes
SHA-256: 804d11128f635dce7e2ae8ee77a6eb21f357755760facae5daacf5795e91cf1f
font_01_sfnt_off0001152b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1152B 11352 bytes
SHA-256: a31b156592f0c4111db124b49ed5fe321774f0cfa2c1f672a57b0fbec90b872b