Malicious PDF — malware analysis report

Static analysis result for SHA-256 3dd7d87e825d53df…

MALICIOUS

PDF

73.5 KB Created: 2021-03-19 18:40:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 245da82a2d2ef859c74948ea51118173 SHA-1: 528d0cf2c49944a75d99711c1ad05b187d740775 SHA-256: 3dd7d87e825d53dfe4c34467375c752071066c8c2c562d231446c66ef1abf3f5
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous external URLs, many of which are hosted on disposable domains, suggesting a link farm or distribution network. The document body, though heavily obfuscated, appears to be a lure related to parts manuals, aiming to trick users into visiting these malicious links.

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
  • 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://druttle.ru/wix?keyword=jaguar+xk8+parts+manual PDF link annotation
    • http://digtalcaliper09.xyz/theories_of_communication_networkspfojs.pdfIn PDF document text
    • http://tomandbxof.site/96040516602qh67q.pdfIn PDF document text
    • http://buybritishcat.com/3937986044544ku4.pdfIn PDF document text
    • http://speak4pro.com/noluxebujisasi4d5gc.pdfIn PDF document text
    • https://cdn.sqhk.co/faruvate/jdhbijt/tiles_for_kitchen_floor_price.pdfIn PDF document text
    • http://my-favshope.online/dell_latitude_e6410_parts_manualsmqps.pdfIn PDF document text
    • http://piloderib.22web.org/ba_2nd_year_books.pdfIn PDF document text
    • https://cdn.sqhk.co/butituguxur/c1OICKk/draw_climber_apk_mod_dinheiro_infinito.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://788ae96d-7a4f-4726-91a9-07bb742fb3e7.filesusr.com/ugd/97aff7_3cf5bdd9639741d08bd7c53370e9f843.pdf?index=trueIn PDF document text
    • http://tuninedup.epizy.com/feasibility_study_template_word.pdfIn PDF document text
    • http://wadumoseri.rf.gd/30784467036.pdfIn PDF document text
    • https://5fa60de5-32ab-41ac-ba65-77330e21e623.filesusr.com/ugd/2e16aa_59d9fab1adc84b548a7d9ab1294d326a.pdf?index=trueIn PDF document text
    • https://411be8f8-4ba1-40b5-9edf-cc4a2c3d5ecc.filesusr.com/ugd/a86d68_7be956b3237a42478eef353abc51d8f2.pdf?index=trueIn PDF document text
    • http://julisanusifi.rf.gd/69925681997.pdfIn PDF document text
    • http://pokukalaso.rf.gd/14811321217.pdfIn PDF document text
    • http://sujegulagu.epizy.com/weber_spirit_2_grill_grates.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_off0000df24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF24 5456 bytes
SHA-256: cb8b571f089027362110452b4020eca0046f6b62fcfd723e0dc04fa6fb20a3f5
font_01_sfnt_off0000f1a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1A3 11092 bytes
SHA-256: d48c1d428aa110949895b495470fe88745d7d585c4ecac42576966622f3ca16b

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