Malicious PDF — malware analysis report

Static analysis result for SHA-256 35efac9f21712d4c…

MALICIOUS

PDF

84.5 KB Created: 2021-02-28 16:06:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: c59b6ef52bbfc6624292ddfc91e6af6c SHA-1: b125a48d8761dfef54a90640179a2807b0027f7c SHA-256: 35efac9f21712d4c72633b0928a0323812949abf6c8b0a2f6b7d86d9778bef33
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, specifically flagged as a phishing trojan. It contains numerous external URLs, many hosted on disposable domains, suggesting a link farm designed to redirect users to potentially malicious sites. The document body, though heavily obfuscated, contains references to wkhtmltopdf and a date, indicating it was likely generated programmatically to serve as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://golowaki.ru/award?keyword=how+do+trauma+narrative+workers+make PDF link annotation
    • http://koxelovanalimu.getenjoyment.net/ashrae_handbook_fundamentals_2001_free_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384460/normal_602c0cee1fc6a.pdfIn PDF document text
    • http://taforojujutusig.mygamesonline.org/can_a_cracked_heat_exchanger_be_dangerous.pdfIn PDF document text
    • http://sibatike.getenjoyment.net/29950945987.pdfIn PDF document text
    • http://pogawubujogeje.mypressonline.com/journey_to_the_west_2_full_movie_download_in_tamil.pdfIn PDF document text
    • http://pofaduxiruk.getenjoyment.net/jobasidifan.pdfIn PDF document text
    • http://revilokepudidu.mygamesonline.org/how_to_read_a_myocardial_perfusion_scan.pdfIn PDF document text
    • https://cdn.sqhk.co/reretukida/hiih723/british_rowing_championships_2019_results.pdfIn PDF document text
    • http://bagerisevi.scienceontheweb.net/42678301700.pdfIn PDF document text
    • http://garanibukumom.scienceontheweb.net/jarasorem.pdfIn PDF document text
    • http://xelasurugopu.mywebcommunity.org/uses_uracil_instead_of_thymine.pdfIn PDF document text
    • http://lorewipa.scienceontheweb.net/dark_souls_bosses_dlc.pdfIn PDF document text
    • https://cdn.sqhk.co/bokirebi/iiDigc6/chores_by_age_free_printable.pdfIn PDF document text
    • https://cdn.sqhk.co/xibidodoko/e70iaxW/sunexoxulexifokexajaluko.pdfIn PDF document text
    • http://xepelewatelaziv.getenjoyment.net/59465513260.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jasunusemoki.onlinewebshop.net/22031273407.pdfIn PDF document text
    • http://ligoroxenafof.atwebpages.com/how_to_connect_att_cordless_phone_to_base.pdfIn PDF document text
    • http://gumomexad.onlinewebshop.net/voronas.pdfIn PDF document text
    • https://s3.amazonaws.com/xovajukoxin/tokyo_drift_song_muzmo.pdfIn PDF document text
    • https://s3.amazonaws.com/badodemebo/31557216399.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_off00010e96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E96 5116 bytes
SHA-256: baf6f134ccd5b977cea4aa5838fed3d0c28d46de21cd401cbb6aa55e0a1ce834
font_01_sfnt_off00011ffc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FFC 10844 bytes
SHA-256: 7a41d38528eef4c5a692c5bd50f7cc32c1d211be271e0305f65a7e94f64f5ddb

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