Malicious PDF — malware analysis report

Static analysis result for SHA-256 67c1518ad13cfd8a…

MALICIOUS

PDF

78.3 KB Created: 2021-04-17 14:26:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 27ec379912da11d0b70e6c905b645bad SHA-1: 6c14bbf4af5651fcb43a2f773df247281e299d07 SHA-256: 67c1518ad13cfd8a9672deb764420db203e91d1e5036a303acf1294d20926832
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one heuristic specifically identifying a 'PDF link farm' designed for SEO manipulation. The document body, though heavily obfuscated, contains text related to 'lg smartphone repair near me', suggesting a lure to trick users into visiting malicious URLs. The presence of ClamAV and ML heuristics flagging it as malicious reinforces this assessment.

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://pelibifir.ru/strik?utm_term=lg+smartphone+repair+near+me
    • https://cdn-cms.f-static.net/uploads/4366388/normal_601a009712e06.pdf
    • https://static.s123-cdn-static.com/uploads/4451225/normal_5feb5cb40a554.pdf
    • http://xuponigivixi.66ghz.com/apocalypse_world_playbooks.pdf
    • https://cdn-cms.f-static.net/uploads/4408343/normal_604982eaac45d.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://sabasil.epizy.com/girl_scout_cadette_field_day_badge.pdf
    • https://b9eb3541-094c-4606-b101-17c2291fd6e1.filesusr.com/ugd/a18601_44b357f679414a27b5b0ad57f3a766af.pdf?index=true
    • https://cf268418-7549-4780-9cff-e39e61b5276c.filesusr.com/ugd/0b1cf2_68baa07fd0d84ff08226f2d77543d11e.pdf?index=true
    • https://uploads.strikinglycdn.com/files/530b12ce-e174-4066-a4b8-862683ad1cc5/descargar_el_lenguaje_secreto_de_tu_cuerpo.pdf
    • https://uploads.strikinglycdn.com/files/cf0bf9cd-fbd4-419c-8683-29839c86558e/the_macro_economy_today_14th_edition.pdf
    • http://toxamifobofu.epizy.com/golipon.pdf
    • https://uploads.strikinglycdn.com/files/e39df392-e9a7-4d5b-b264-83d2fd6a0251/tobomodilaxizuzebagulepuj.pdf
    • https://uploads.strikinglycdn.com/files/45cdddc3-9f38-4cb5-9455-02c9e37308ef/kufibuwexosaxem.pdf
    • https://uploads.strikinglycdn.com/files/f87f711c-d8d7-481d-8235-9221bffe265b/94919160219.pdf
    • https://uploads.strikinglycdn.com/files/87dc2248-39d2-413d-87af-1b72c62d4864/cycleops_mag_trainer_replacement_parts.pdf
    • https://uploads.strikinglycdn.com/files/a1d9d45f-4878-4fc0-a46d-ac214331da60/samsung_hw-h550_remote_control.pdf
    • http://vatilibudavelit.rf.gd/worksheet_based_on_articles_for_class_2.pdf
    • https://uploads.strikinglycdn.com/files/74d3beaa-3394-4f3f-941d-47a996c6e0b7/write_to_text_file_python_for_loop.pdf
    • http://sapirabiv.rf.gd/55445856019.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_off0000e828.bin
87073625610621a7eebbc216dc96c0de1d09be3c20966d1427005ce9cb55cfe1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE828 4928 bytes
font_01_sfnt_off0000f8bc.bin
c1d4a5db9f2abc41d9a8f4137f311922abc81c15050173a73c158fc0bb02f91f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF8BC 10892 bytes
font_02_sfnt_off00011d53.bin
ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11D53 4324 bytes

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