Malicious PDF — malware analysis report

Static analysis result for SHA-256 616dd87ca1770be7…

MALICIOUS

PDF

77.3 KB Created: 2021-04-04 00:04:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9401215d8fde512a4de551be88d6ad2e SHA-1: 5e789b5829d02ec2b2ad3c382337d4477248189f SHA-256: 616dd87ca1770be7dcececdcb1ebc4d45d572d000524703a7fe889318949d16d
156 Risk Score

Malware Insights

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

The PDF document contains numerous external links, many of which are structured as SEO-friendly URLs, suggesting a link farm or spamming operation. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as phishing. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://dafemum.ru/wix?keyword=genie+universal+remote+manual
    • https://cdn-cms.f-static.net/uploads/4476582/normal_605ba02f76dc0.pdf
    • https://wolixakeju.weebly.com/uploads/1/3/6/0/136002716/bafotonukuris.pdf
    • https://cdn-cms.f-static.net/uploads/4387243/normal_60520dc79c08d.pdf
    • http://whowill.ru/96192869044unzdd.pdf
    • https://cdn-cms.f-static.net/uploads/4450244/normal_5fdbb76a5fde9.pdf
    • http://negisalipividul.iblogger.org/lausd_mclass_reports.pdf
    • https://cdn-cms.f-static.net/uploads/4445557/normal_605fa85b143c8.pdf
    • https://fupobemoxu.weebly.com/uploads/1/3/4/6/134669325/renuzefojig_sisenujojima_tubizo_lewilafoxugo.pdf
    • https://static.s123-cdn-static.com/uploads/4445130/normal_5fe3e4facb9f8.pdf
    • https://xexifenenufomag.weebly.com/uploads/1/3/6/0/136082553/3539768.pdf
    • https://static.s123-cdn-static.com/uploads/4405899/normal_5fcb2178e3f30.pdf
    • http://spain50off.info/17196867183yz3tu.pdf
    • https://cdn.sqhk.co/lubometusoz/pzgh4bB/ninja_village_naruto_game_download.pdf
    • https://cdn.sqhk.co/pugudanirav/Ao9jggg/ryan_toys_fake_video_call_on_facebook.pdf
    • https://jewefero.weebly.com/uploads/1/3/1/3/131383264/bab3a92804ed.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://vefobop.epizy.com/74083641356.pdf
    • http://lamekukibudinos.epizy.com/toyota_avensis_2005_workshop_manual.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e4ed.bin
be71c8465ebf5c5b295e0c771c624696983968129767e1094ee6364503755bda		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE4ED 4804 bytes
font_01_sfnt_off0000f52b.bin
27260abbf21622c36fe3e4d5e678befcde0371f4ab60c5db4626bbd8b809890c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF52B 10932 bytes
font_02_sfnt_off00011a61.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11A61 4324 bytes

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