Malicious PDF — malware analysis report

Static analysis result for SHA-256 adde3105d31b6f90…

MALICIOUS

PDF

72.4 KB Created: 2021-02-17 06:24:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 42711e68fd95850a04a3975794530c4c SHA-1: 9d82b387e765e584c9df9dddb5d5fd903423e748 SHA-256: adde3105d31b6f907954222fe519d396c7bb795874fb7d9eb9480acab84bb748
184 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, appears to contain search query-like text, suggesting a phishing or scam lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to deliver a second-stage payload via the redirector.

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/aws?utm_term=how+do+i+connect+apple+tv+3rd+generation+without+remote In PDF document text
    • https://cdn-cms.f-static.net/uploads/4457590/normal_6013870ac83e7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453327/normal_5fccc479d4244.pdfIn PDF document text
    • http://oneplusonemain.xyz/xuwusewm20bw.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384482/normal_5ff38c5658615.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374540/normal_600d5bb3eed7a.pdfIn PDF document text
    • https://cdn.sqhk.co/noxivudeva/iinipPM/junkyard_tycoon_car_business_simulation_game_mod_apk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391331/normal_5ffbd90754ff1.pdfIn PDF document text
    • https://cdn.sqhk.co/lojosexotak/hIxeI1Q/goal_line_blitz_3.pdfIn PDF document text
    • http://agent-spv.space/wixabewodonelpt5l.pdfIn PDF document text
    • https://cdn.sqhk.co/vinasujitupe/dugdYhe/pressure_washer_home_depot_black_friday.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://juwebud.epizy.com/41587126093.pdfIn PDF document text
    • http://tuxesoguzegisox.epizy.com/atom_untuk_linux.pdfIn PDF document text
    • http://fapadosijavo.epizy.com/92645665019.pdfIn PDF document text
    • http://nabotiwufonego.epizy.com/nujepoxagezagatazakawapa.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_off0000dc54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC54 5588 bytes
SHA-256: 3cd01c9c22bce5c9c3f7e5af14e9974fa1c727c2315398179329e88f4b1e6326
font_01_sfnt_off0000ef42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF42 10884 bytes
SHA-256: 061ead72bb41dc25a33426a2145225d492b5e40f4a9121bd967cc61ba626eff3

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