Malicious PDF — malware analysis report

Static analysis result for SHA-256 70b088c5c60b1a0d…

MALICIOUS

PDF

77.0 KB Created: 2021-06-07 09:56:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: f7b69f7c9051aaed569f2d38faabd435 SHA-1: aa0d0b5cfedbf5621abd175a2e21db2ca37b1b6d SHA-256: 70b088c5c60b1a0d549682bb7b4b6b7f470128bf9d252289bb8c81219380f936
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains a large number of external links, many hosted on disposable domains, suggesting it functions as a link farm. The primary URL, 'https://coretry.ru/pbw?utm_term=the+book+thief+%25282013%2529+movie+download+free', appears to be a lure for movie downloaders, likely redirecting to phishing or malware sites. No scripts were extracted, but the PDF structure and link farm behavior are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://coretry.ru/pbw?utm_term=the+book+thief+%25282013%2529+movie+download+free PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4386622/normal_602268f17c902.pdfIn PDF document text
    • https://turamuko.weebly.com/uploads/1/3/4/4/134458704/mupalebozolaxif.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422906/normal_6017c6965b0c9.pdfIn PDF document text
    • https://xudixakutax.weebly.com/uploads/1/3/0/7/130776611/dowuresokiv-tilan.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450878/normal_604f2cf3663a4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426823/normal_601ab99be0525.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449992/normal_5fe3bf8687618.pdfIn PDF document text
    • https://tasovobikawunuz.weebly.com/uploads/1/3/4/8/134850854/1bc78d1ff5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445882/normal_5ffcdf4b77956.pdfIn PDF document text
    • https://pupoximoz.weebly.com/uploads/1/3/4/5/134584835/terori.pdfIn PDF document text
    • https://wufenimikefi.weebly.com/uploads/1/3/4/3/134366244/71451d9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485165/normal_5ff4c15594add.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459470/normal_606808be8cb62.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369922/normal_604ee696b01ba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380522/normal_6062f30f80249.pdfIn PDF document text
    • https://weradarodoruz.weebly.com/uploads/1/3/4/7/134744379/b672b451.pdfIn PDF document text
    • https://naboparukoxe.weebly.com/uploads/1/3/3/9/133997388/9a21764.pdfIn PDF document text
    • https://gakutuzopekok.weebly.com/uploads/1/3/4/6/134605442/f543b36c9d3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450509/normal_6043df3914f0b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/3f8537c1-674f-470c-9d9e-7a4658b7f5b1/nenekupika.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e618aed2-9eec-4320-8098-c6c9d33bc594/hp_laserjet_1012_windows_10_driver.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ff2634b8-0d81-41b0-bcc9-c2d29707da6a/8814782710.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dfd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFD7 5704 bytes
SHA-256: 6f742ad832c24978fff06b9cca9eec90a584c141c9ff80195649b0eb9f90d0a0
font_01_sfnt_off0000f33b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF33B 10692 bytes
SHA-256: 98c7a6b28a5b074f0f6ec52461a58d707e25fa0dea286149ea2da8cd3f41d93f
font_02_sfnt_off000117ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117BA 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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