Malicious PDF — malware analysis report

Static analysis result for SHA-256 20d6477b76604976…

MALICIOUS

PDF

73.6 KB Created: 2021-05-23 16:11:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 10315466fbf7a3faeec2d93cbd935d4e SHA-1: c0548ce96dafe651f28753d55ca3d763192e7286 SHA-256: 20d6477b76604976b33e7c41f084c06756c40ea9a080c33c937021b1816bbc17
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, flagging it as a phishing trojan. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or phishing operation. The document body, though heavily obfuscated, contains a title related to washing a travel pillow, which is likely a lure to direct users to the malicious URLs.

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://baarspo.ru/strik?utm_term=how+to+wash+a+travel+pillow PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4456135/normal_602abdc311a1e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479905/normal_5ffd0a2c1ed76.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488804/normal_601b369b5dd50.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486036/normal_5fcce40e9d1ed.pdfIn PDF document text
    • https://mafetoga.weebly.com/uploads/1/3/0/8/130874134/sanikum.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385010/normal_5feaecef4b07d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481273/normal_601dbd53cc072.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477181/normal_5fc9548f21652.pdfIn PDF document text
    • https://xisiwifuroki.weebly.com/uploads/1/3/5/3/135323104/9710936.pdfIn PDF document text
    • https://retuxuzuj.weebly.com/uploads/1/3/4/6/134688644/2857087.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477658/normal_6047cc59f041b.pdfIn PDF document text
    • https://muwilumi.weebly.com/uploads/1/3/0/8/130813533/dobatazuda_jenixajo_deronuxabazol_zimasixifu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366367/normal_603e791d3434c.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/a956b563-9ad8-412d-864d-46e045c0e51c/59026779094.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1dceca4b-a539-4314-8f57-871141fedd33/80485657839.pdfIn PDF document text
    • https://s3.amazonaws.com/xufaxoferugod/tezulasugojugew.pdfIn PDF document text
    • https://s3.amazonaws.com/tesapibebujep/attraction_2017_tamil_dubbed_movie.pdfIn PDF document text
    • https://s3.amazonaws.com/jedadokuti/what_is_poverty_jo_goodwin_parker_questions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/98218a5a-3a16-4d5f-807b-70258d188d4e/39506811922.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_off0000e2bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2BF 5020 bytes
SHA-256: b2cfb4d184b45799f5ed1bf9e687952fc80000d9773e16314ff8a3f3ac2e7ace
font_01_sfnt_off0000f3e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3E0 10932 bytes
SHA-256: 11af1fec35b454de08408d60052d16e287abda6ac11e3e13fe4df6ce818e1b6a