Malicious PDF — malware analysis report

Static analysis result for SHA-256 f097cb38e90011e1…

MALICIOUS

PDF

82.8 KB Created: 2021-03-25 02:42:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6b5d65022353e45f6fd0809479652b3e SHA-1: 7a779d5fddfa141d70925a07061356b87aa988d1 SHA-256: f097cb38e90011e1ed8cd13cf0b9a5e15f03f0bdae71b1e8e8825aaba01b6e44
126 Risk Score

Malware Insights

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

The file is a PDF document that contains numerous embedded URLs, many of which point to disposable hosting domains. The ML classifier and ClamAV detection strongly indicate maliciousness, specifically a phishing or trojan distribution attempt. The document body, though heavily obfuscated, suggests a lure related to 'Pandora rings size guide', which is likely a pretext to drive users to the malicious URL for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://ponafet.ru/wix?keyword=pandora+rings+size+guide
    • http://zisesir.22web.org/restrictive_and_nonrestrictive_adjective_clauses.pdf
    • https://cdn.sqhk.co/tamupoto/iicJhbf/finger_paint_coloring_book.pdf
    • http://patavitukazinaz.iblogger.org/cours_tronc_commun_bac_international_maroc.pdf
    • https://cdn.sqhk.co/zenekukera/hrhd0jS/agnostic_religion_meaning_in_urdu.pdf
    • https://cdn.sqhk.co/kagurase/bhg8jgh/sizawigize.pdf
    • https://cdn.sqhk.co/gabamulijawe/ghhdhh9/werewolf_costume_easy.pdf
    • https://cdn.sqhk.co/nexasolonit/gchghgQ/cover_orange_players_pack.pdf
    • http://zenajok.medianewsonline.com/8190000109.pdf
    • http://tidedejix.iblogger.org/dante_s_inferno_an_animated_epic_movie.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/9e536cc3-5dd7-44f4-b8ed-632935a264dd/pezigedunigawaxesudijetig.pdf
    • http://xazexunipix.epizy.com/66703497935.pdf
    • http://fekunowan.epizy.com/widajumiboguvexegi.pdf
    • http://dakokaxawizepu.epizy.com/swiftkey_keyboard_apk_old_version.pdf
    • https://s3.amazonaws.com/salosibejodod/android_network_access_point.pdf
    • http://rutipozi.epizy.com/waltz_in_c_minor_chopin.pdf
    • http://litabasiker.onlinewebshop.net/94308235442.pdf
    • http://dotopaku.atwebpages.com/dictionary_of_biblical_theology_xavier_leon_dufour.pdf
    • http://luregaw.onlinewebshop.net/rojisofefugazigavumuvab.pdf
    • https://s3.amazonaws.com/jodabiladezot/belt_and_road_initiative_indonesia.pdf
    • http://luvojidepezepag.epizy.com/62188926541.pdf
    • https://s3.amazonaws.com/gofilafixu/how_to_fight_with_a_viking_axe.pdf
    • https://s3.amazonaws.com/feliso/engineering_drawing_sectioning_exercises.pdf
    • https://uploads.strikinglycdn.com/files/d7e7f546-5058-452f-a2b8-94a053ce13cc/online_quran_course_free.pdf
    • http://pugotividat.epizy.com/cephalometry_in_orthodontics_2d_and_3d.pdf
    • https://s3.amazonaws.com/wemazun/zeripirub.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_off00010754.bin
33d9ddee62e9c4fb789d58fbb97dc94dacac2869e0d3a038892c3c9edf88d06f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10754 5012 bytes
font_01_sfnt_off00011876.bin
6c007289dfe3014057bd7f6504114e3e1d0c745716a0ad515e95b1ad6df47b6e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11876 10864 bytes

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