Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa69290c917ee4f9…

MALICIOUS

PDF

80.9 KB Created: 2021-05-27 10:15:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 5d5ea187f69246b75b1986d1f1283f7d SHA-1: 2333cb96a9d38a2f69d8e2f913c71295544ce4b6 SHA-256: fa69290c917ee4f98b95968e566f1790255fb0947b0e1cb00d8159e075830da1
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many hosted on disposable domains like weebly.com, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, with the document body and heuristics pointing towards a lure for further exploitation. No scripts were extracted, but the PDF structure itself facilitates the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://druttle.ru/strik?utm_term=human+biology+lab+manual+14th+edition+answers PDF link annotation
    • https://golurivuj.weebly.com/uploads/1/3/4/7/134744385/fbf7108bac2a.pdfIn PDF document text
    • https://lemevepavakupe.weebly.com/uploads/1/3/4/7/134701524/mejomak-nidoxipivikavin.pdfIn PDF document text
    • https://pumaxodevuk.weebly.com/uploads/1/3/1/8/131872084/dagimulitose.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392868/normal_602d0cba93c4e.pdfIn PDF document text
    • https://dozisinabi.weebly.com/uploads/1/3/4/6/134646642/2801470.pdfIn PDF document text
    • https://pidorisegis.weebly.com/uploads/1/3/4/7/134761928/6187218.pdfIn PDF document text
    • https://vipamabukaxeban.weebly.com/uploads/1/3/0/8/130874648/9447995.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393890/normal_5ff0b77bafc09.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/e5533108-5e02-4614-93e2-0422825857d9/emotion_regulation_measure.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e61419b5-cbdc-40ce-9dc2-076d9f43bdd6/gamumixidokoj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fac33350-f36d-45a8-b60e-796e96e942c2/easy_painting_ideas_on_canvas_step_by_step.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/22d39b3a-27dd-4c3d-9090-4d12c6a53f5d/nuzevalafutowijefis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7de520a4-73d6-4944-b1dd-0cb6122fe582/resumen_de_la_biblia_catolica.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/37c0776a-b479-497a-8022-6b8f2416d1f0/how_much_is_a_cdl_in_oklahoma.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_off0000fbe2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBE2 5672 bytes
SHA-256: eddc77052ada84df1d975ff1eba6c0def7f00c41046755c4407702c603237caa
font_01_sfnt_off00010f17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F17 11792 bytes
SHA-256: 6518af01f7a3ae265df8bab2aa8fe1caff4a6ccb3a10bac36195dc37cd4621ad

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