Malicious PDF — malware analysis report

Static analysis result for SHA-256 495fe790758e797d…

MALICIOUS

PDF

81.1 KB Created: 2021-03-10 12:22:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: f7b280160f4bb8001b2117eb923a3b3a SHA-1: 1981d84b66c652b437d4a3f8f626c0b857b00ef1 SHA-256: 495fe790758e797d7779a8fd1f4cefabeec05975f7852277c0479299e4388ba2
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs and embedded URLs, many pointing to disposable hosting, suggesting a link farm or redirection mechanism. The document body, though heavily obfuscated, contains text related to 'Idiot test game answers', indicating a social engineering lure to entice users to click on the malicious links.

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://nipisod.ru/123?utm_term=idiot+test+game+answers PDF link annotation
    • http://steblin.pro/47620021245zeon7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367648/normal_5fc91e3e39f63.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427105/normal_5fccdb91201e8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4529977/normal_5fd8cc9415c61.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478968/normal_5fcf93a96a59a.pdfIn PDF document text
    • http://zoom-omsk.ru/sawaduzujozemihahth.pdfIn PDF document text
    • http://ita-yog.space/16945382013u4ihx.pdfIn PDF document text
    • http://jakor.pro/what_jobs_use_ictpw47u.pdfIn PDF document text
    • http://umdtheatre.ru/821741148076wpes.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414332/normal_5fd08a0e2c050.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421040/normal_600b791914b7c.pdfIn PDF document text
    • http://pinegobojefo.getenjoyment.net/tatikotibajudemubupe.pdfIn PDF document text
    • http://kavelokafozi.medianewsonline.com/what_are_the_similarities_and_differences_between_cats_and_dogs.pdfIn PDF document text
    • http://texno3ua.com/bijli_ki_taar_video_mr_jatttzact.pdfIn PDF document text
    • http://help-violation.com/zelda_ocarina_of_time_3ds_walkthrough_goron_cityknwqn.pdfIn PDF document text
    • http://fitokaps.xyz/logitech_extreme_3d_pro_joystick_user_manualj337g.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377642/normal_603eae29ee404.pdfIn PDF document text
    • http://bigmagazin.xyz/best_self_cleaning_cat_litter_box_for_multiple_catsdyg0m.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/tokit/doletesagomivomojogeworu.pdfIn PDF document text
    • http://megigezorozo.atwebpages.com/gopiguj.pdfIn PDF document text
    • https://s3.amazonaws.com/posufij/39667783562.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_off0001005a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1005A 5140 bytes
SHA-256: 21ce2d0149c7bb0eae3dd3d403c0ddcfedaef476584f38fd36ef568748e058dd
font_01_sfnt_off000111cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111CF 10996 bytes
SHA-256: 6088547e3f866df2dd92b4515ee4d078a3a3df9672ace780fb63c540f4d866c2

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