Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff6ddb2c2c0d0668…

MALICIOUS

PDF

78.5 KB Created: 2021-02-15 07:54:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 9bb48f6f67c3c4cc3cfa89b1acea5749 SHA-1: bc877efc9b6f149446bcada73c63a6baf0aa40d5 SHA-256: ff6ddb2c2c0d066869c603c1bdabe3e353d871b2a661fa0bb71b5ff185a36373
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs pointing to link farms hosted on disposable domains, a common tactic for phishing or distributing further malware. Heuristics indicate these links lead to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/wix?keyword=pokemon+go+games+unblocked In PDF document text
    • https://cdn.sqhk.co/xawefigi/yNjalji/tazupe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420431/normal_5fce62d72809b.pdfIn PDF document text
    • https://cdn.sqhk.co/tosuwukiwate/ia3ijhg/scrabble_dictionary_cheat_tool.pdfIn PDF document text
    • https://cdn.sqhk.co/lepemafe/iifMtjj/lords_mobile_dressing_room_apk.pdfIn PDF document text
    • http://trokot-shtorki.online/philips_air_cleaner_manualfr781.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448096/normal_5fe90d65c6e98.pdfIn PDF document text
    • http://sberpodarok2020.online/stative_verbs_exercises_pre_intermediatefrboj.pdfIn PDF document text
    • http://tikonazab.iblogger.org/65206042510.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471467/normal_5fd399e981c49.pdfIn PDF document text
    • https://cdn.sqhk.co/difigobon/2jdjdID/demon_hunter_set_dungeon_marauder.pdfIn PDF document text
    • https://cdn.sqhk.co/zukasedu/EQjbjgO/4_months_9_days_in_weeks.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4498868/normal_601e24248cda1.pdfIn PDF document text
    • https://cdn.sqhk.co/kukisigafumi/Q5Dchew/fomedavifokibulesu.pdfIn PDF document text
    • http://instgrmmverifiedbadge.com/connacht_rugby_fixturesqckv9.pdfIn PDF document text
    • http://kinoxca.xyz/78741678711ng1h7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rivadejupogutun.epizy.com/49734734190.pdfIn PDF document text
    • http://xinudekewukipi.rf.gd/freecell_solitaire_for_windows_10.pdfIn PDF document text
    • http://gipumupanaw.rf.gd/wonosazaje.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_off0000f4d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4D4 5368 bytes
SHA-256: fe9169d63366e6aa3d2852ada6704994e57f4cd87060d38e6f572815cdd4217f
font_01_sfnt_off0001070a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1070A 11028 bytes
SHA-256: a27cd62cc5ec7f8bc9e9156d29db5f4fe83ae90abf84fad97d2fe6ff8e65cb0b

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