Malicious PDF — malware analysis report

Static analysis result for SHA-256 338c25be07fc629b…

MALICIOUS

PDF

72.0 KB Created: 2021-03-12 22:17:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: e432cf8387598877542ed3d3549ecf29 SHA-1: 191924a8cb9ec13ab80106c03f8db0429c6c8412 SHA-256: 338c25be07fc629be869b57762621cc91ffd237ff1167235ad2aa75176dc6522
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://mezovuduw.ru/123?utm_term=chromium+browser+free++windows+10 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4481170/normal_6021f7e0e749a.pdfIn PDF document text
    • http://nitiwopororotef.mypressonline.com/which_graco_sprayer_to_buy.pdfIn PDF document text
    • https://cdn.sqhk.co/tesikotuk/s0bgdno/82825520044.pdfIn PDF document text
    • https://cdn.sqhk.co/mazinenik/go0hgdK/subway_princess_endless_run_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/nukusigemug/enEghWf/striper_fish_in_spanish.pdfIn PDF document text
    • http://jisetatiloro.scienceontheweb.net/lozuwe.pdfIn PDF document text
    • https://cdn.sqhk.co/devepogisog/jaRxmig/loudest_alarm_clock_sound_on_iphone.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497370/normal_6034a15a97a76.pdfIn PDF document text
    • https://cdn.sqhk.co/kemivabesu/jjRylfd/epic_games_2fa_enabled_but_not_working.pdfIn PDF document text
    • https://cdn.sqhk.co/buzaxelubot/hjhpidZ/flights_to_florida_from_slc.pdfIn PDF document text
    • http://vofufime.mypressonline.com/bach_minuet_in_g_minor.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392199/normal_602d9a6877757.pdfIn PDF document text
    • https://cdn.sqhk.co/jaxubefe/gghbBuu/sword_art_online_rpg_maker_game.pdfIn PDF document text
    • https://cdn.sqhk.co/tarudifirew/ggLbpij/comprar_recarga_claro_guatemala.pdfIn PDF document text
    • http://tegor.xyz/52081369260qug2i.pdfIn PDF document text
    • https://cdn.sqhk.co/posukomokufi/ijgiggd/sample_business_case_study_template.pdfIn PDF document text
    • http://towufato.mywebcommunity.org/cirque_du_freak_darren_shan_summary.pdfIn PDF document text
    • http://redpandarecycling.com/1609839281399xac.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jisijuvod.myartsonline.com/mental_status_examination_form_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ddbf53a7-4975-448d-9930-2d2dfad53aaf/best_pvp_weapons_dark_souls_3_2019.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b6807021-366f-45bf-9282-ac1cd52383e5/best_psychological_books_2020.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_off0000de7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE7C 5236 bytes
SHA-256: 859006f0f7fd7de1c5ff8a56993ccfe667ea2a68b2a4267e3ad8f67836bd655a
font_01_sfnt_off0000f032.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF032 10196 bytes
SHA-256: b653f005e552b1b5a6dc7fc46bc24649851ec56a61021174acb4eb3a311877a4

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