Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcf3af00e6b2ed47…

MALICIOUS

PDF

79.1 KB Created: 2021-03-12 02:30:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 018f162a8994ce79a1766ca14b15c281 SHA-1: 48078001088253720fd89c7bf5c9d580f17cc073 SHA-256: bcf3af00e6b2ed47bad615da9d8ec7f1d19d518ad7e1ad23e2df6bbfcf60d062
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with several pointing to disposable hosting and functioning as a link farm, suggesting a phishing or malware distribution scheme. The document body, though heavily obfuscated, contains metadata related to 'wkhtmltopdf' and a date, but no clear textual lure. The presence of external URIs and the link farm heuristic strongly suggest the document's purpose is to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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=abstract+algebra+dummit+solutions+pdf PDF link annotation
    • http://vannabanyavsedela.xyz/fexukajusimebisibilinax70.pdfIn PDF document text
    • http://metryck.info/69405273101och4o.pdfIn PDF document text
    • https://cdn.sqhk.co/wodaximewule/jfbgiGz/final_fantasy_xv_pocket_edition_hd_switch_gameplay.pdfIn PDF document text
    • https://cdn.sqhk.co/ganuniwiku/f6yhaNw/ridezadebarajavexeva.pdfIn PDF document text
    • https://cdn.sqhk.co/zewezerezi/BhjSG66/wijofutepadenose.pdfIn PDF document text
    • https://cdn.sqhk.co/nanijamu/giOBggi/did_huey_long_oppose_the_new_deal.pdfIn PDF document text
    • http://specrazreshenie.com/sekonic_l-308s-u_manualpz7fe.pdfIn PDF document text
    • https://cdn.sqhk.co/ninoporaleva/jaTKido/sad_ringtone_tik_tok.pdfIn PDF document text
    • https://cdn.sqhk.co/zifeduwa/hdlyzij/sky_battle_lightning_air_force_online_combat_training.pdfIn PDF document text
    • http://vowujebotoza.mywebcommunity.org/why_is_my_petsafe_collar_beeping.pdfIn PDF document text
    • http://opensoda.pro/nomabigigutiwimufeni4bqzn.pdfIn PDF document text
    • https://cdn.sqhk.co/sesijisova/OgghidB/catchmaster_fly_trap_label.pdfIn PDF document text
    • https://cdn.sqhk.co/wepiwuvume/iijeRRT/cookie_macaron_pop_sweet_match_3_puzzle.pdfIn PDF document text
    • http://bikelumonekodex.mygamesonline.org/how_to_set_snap_on_torque_wrench.pdfIn PDF document text
    • https://cdn.sqhk.co/xemugugafot/MXjjgma/injustice_2_characters_super_moves.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sipanokule.onlinewebshop.net/69036346132.pdfIn PDF document text
    • https://s3.amazonaws.com/wuniku/tadidejexirorularalilolef.pdfIn PDF document text
    • http://zitulogakapede.myartsonline.com/pallet_truck_servicing_near_me.pdfIn PDF document text
    • https://s3.amazonaws.com/pasawexawinogad/89062706081.pdfIn PDF document text
    • https://s3.amazonaws.com/busutafitufe/tugimesatuxawamebagavu.pdfIn PDF document text
    • https://s3.amazonaws.com/lakujusitejojet/funza_lushaka_bursary_application_form_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/napoledunadigo/kemaj.pdfIn PDF document text
    • https://s3.amazonaws.com/vunizi/ceremony_by_leslie_marmon_silko.pdfIn PDF document text
    • https://s3.amazonaws.com/mokixetat/what_are_the_unforgivable_sins_in_catholicism.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_off0000ea4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA4F 5604 bytes
SHA-256: ea88a271d4a25d5c8a4385bae551d6a9a4ae4a289ed59b789f6305715a8d7947
font_01_sfnt_off0000fd44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD44 15456 bytes
SHA-256: 9c8bccf8edd4fb7c2e7c0f25f961fdc087c5aa746979f98a5e65cd9c57ad58ab

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