Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed0cff4f86e8c424…

MALICIOUS

PDF

71.4 KB Created: 2021-04-06 00:38:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dc748136417028a316623e38fa796e27 SHA-1: 99eb88e2b4f6822f51f1cd70fde9932ebab96547 SHA-256: ed0cff4f86e8c4243038188f230f343cd5dcdb52ec0ff10f15a1412cc5adca97
126 Risk Score

Malware Insights

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

The PDF contains an embedded URL that redirects to a site disguised as a user manual, likely a phishing lure. Heuristics indicate the PDF is a link farm on disposable hosting and has been flagged by ML classifiers and ClamAV as malicious. No scripts were extracted, but the overall structure and embedded URL suggest a phishing attempt to trick users into visiting a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://maypoin.ru/wix?keyword=delonghi+portable+air+conditioner+user+manual
    • http://biniwitovo.mywebcommunity.org/pegow.pdf
    • https://cdn-cms.f-static.net/uploads/4418565/normal_6060488f4c52c.pdf
    • https://cdn-cms.f-static.net/uploads/4378171/normal_605be85cef193.pdf
    • https://cdn.sqhk.co/dojaxeje/djbTMIc/game_of_thrones_cast_season_3_episode_8.pdf
    • https://cdn.sqhk.co/nezuxada/je9bii7/62625554768.pdf
    • https://cdn.sqhk.co/womafafowix/iiOBggc/78605977103.pdf
    • https://cdn.sqhk.co/miraroki/iayhaig/sputnik_film_alien.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/ff3290c7-e3b2-4ea0-b720-f31a503f004b/how_to_replace_batteries_on_oral_b_toothbrush.pdf
    • https://uploads.strikinglycdn.com/files/ae4ef7f4-e172-4c13-8033-2a90b415176d/47893314504.pdf
    • http://nobapizasiwe.myartsonline.com/list_of_anticoagulants.pdf
    • http://dijejewilibafux.onlinewebshop.net/cbt_work_with_asperger_s_syndrome.pdf
    • http://wodowepakimeko.onlinewebshop.net/ensayos_cepech.pdf
    • https://s3.amazonaws.com/jimugivos/48840635724.pdf
    • https://uploads.strikinglycdn.com/files/31db8ddc-169f-467a-81a9-8d519c033819/budodazigebekifaluketijuj.pdf
    • https://s3.amazonaws.com/gozifep/cerebriform_nevus_causes.pdf
    • http://bolirazebaf.myartsonline.com/22252756350.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dad0.bin
442f56c71f76cf33897212a0232c83f892bec6c546f23d8780fe58f71491e2dd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDAD0 5624 bytes
font_01_sfnt_off0000edbd.bin
f533bb1af521f6897d6db898d0e4c2e05b68eadf83db151a1dac068c2ddee023		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEDBD 10216 bytes

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