Malicious PDF — malware analysis report

Static analysis result for SHA-256 82eac689bec802ff…

MALICIOUS

PDF

75.4 KB Created: 2021-03-20 13:08:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: c835d8dd5e266b08732ed6d2e523b299 SHA-1: 65b9baf00b02ced42ff5c265f06f692097de0d62 SHA-256: 82eac689bec802ffca4fd524f64c91bf173fdc73951419bc7064aa5d54eea472
186 Risk Score

Malware Insights

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

This PDF file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous external URLs pointing to other PDF documents, many hosted on disposable domains. The primary purpose appears to be SEO manipulation or distributing further malicious content, leveraging a large number of external links.

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://nipisod.ru/award?keyword=sharah+qaseeda+burda+shareef+pdf PDF link annotation
    • http://fuwimel.22web.org/91897457988.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373505/normal_5ffda416e626e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501770/normal_5fe9cf21a8226.pdfIn PDF document text
    • https://cdn.sqhk.co/difanemifal/gdiaDgc/jimu_robot_tankbot_kit_review.pdfIn PDF document text
    • https://cdn.sqhk.co/vumojakizaw/pnqThji/2764971950.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405950/normal_60407b58f1e67.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370987/normal_60149f27ceab9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459623/normal_602ed6a3db379.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403672/normal_6036764493208.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477651/normal_5fca77c699535.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379498/normal_6043252e1bb37.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414176/normal_602e3c5a673d5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478398/normal_6008b2a73fe48.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://992bddda-184d-467f-a815-0165b41a2208.filesusr.com/ugd/69695d_4ca114950fe84f749ca4aedb9b526817.pdf?index=trueIn PDF document text
    • https://a86a6b26-b473-4b55-b9aa-7628a2bff077.filesusr.com/ugd/4f270c_1e2a6be433d44ca5bf7f7583eaa6390b.pdf?index=trueIn PDF document text
    • http://fojoxolizono.rf.gd/friedrich_nietzsche_beyond_good_and_evil.pdfIn PDF document text
    • http://tenubitifane.rf.gd/the_old_man_and_the_sea_story_in_english.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_off0000e35a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE35A 5464 bytes
SHA-256: 39ff1a3aad4d0bf493ee1c110882eeb5f17a7eba69cbce55175ceac9df3cbe2c
font_01_sfnt_off0000f5dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5DC 12856 bytes
SHA-256: 71cea8ccd9337cb8599d617589b495de10c3d57a592e41d641028bbbd05af202

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