Malicious PDF — malware analysis report

Static analysis result for SHA-256 f13f7aed68b0f5f0…

MALICIOUS

PDF

66.0 KB Created: 2021-01-23 13:14:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 7ef90084fe28d908c8e812ae89b1db8d SHA-1: df021642434ef7e60307b5659e752655e4c3c2b5 SHA-256: f13f7aed68b0f5f06f70b49b7e9c3dee5dcf804963173d488b4597e3dbd35175
126 Risk Score

Malware Insights

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

The PDF document contains numerous external URIs and is flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan. The document body, though heavily obfuscated, suggests a lure related to free PDF downloads, which is a common tactic for distributing malware or conducting phishing. The presence of multiple disposable hosting links further supports a malicious intent to redirect users to potentially harmful content.

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://traffnew.ru/123?utm_term=libro+la+gloria+por+el+infierno+pdf+gratis PDF link annotation
    • https://cdn.sqhk.co/pasivuzuke/uyAihji/dinghy_boat_for_sale_philippines.pdfIn PDF document text
    • https://cdn.sqhk.co/kagelemovo/jQjhcif/how_to_iron_perler_beads_without_wax_paper.pdfIn PDF document text
    • https://cdn.sqhk.co/beledufe/4hjd3gg/top_lagu_pop_indonesia_terbaru_2020_hits_pilihan.pdfIn PDF document text
    • https://cdn.sqhk.co/rivitovolu/lifiagg/road_race_bike_game_for_pc_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/zofizitene/ihdhbje/jebij.pdfIn PDF document text
    • http://lirerigoteses.22web.org/79197601685.pdfIn PDF document text
    • http://kenaxifinot.22web.org/antutu_3dbench_6._2._7_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/durotula/hidifOl/way_the_ball_bounce_meaning.pdfIn PDF document text
    • https://cdn.sqhk.co/levowexesu/gcS5opk/monkey_type_hack.pdfIn PDF document text
    • http://potaberukogox.66ghz.com/halloween_math_worksheet_for_preschoolers.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375889/normal_5fdb7694132cc.pdfIn PDF document text
    • https://cdn.sqhk.co/levowexesu/hgdjeF9/46462441404.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/xezonijida/leditima.pdfIn PDF document text
    • http://sivigowukom.epizy.com/inspiring_parallax_slideshow_after_effects_template.pdfIn PDF document text
    • http://rolozaj.epizy.com/tamilrockers_hd_movie_2018_isaimini._co.pdfIn PDF document text
    • http://gafelen.epizy.com/placental_abruption_management.pdfIn PDF document text
    • http://kunasajijujaf.rf.gd/clarinet_sheet_music_anime.pdfIn PDF document text
    • http://boribasumagit.epizy.com/nodig.pdfIn PDF document text
    • https://s3.amazonaws.com/fejakixoweka/ketisizobodapitukaw.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_off0000c381.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC381 5288 bytes
SHA-256: 6814fa53636af7a8fd663e31bfa97da2703d89b94ec4f3cac2130347f2f33dcc
font_01_sfnt_off0000d58c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD58C 10800 bytes
SHA-256: f0126afff3045a9d03ec18a66a296d4ccdb559af3454309f2d913a4391db04aa

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