Malicious PDF — malware analysis report

Static analysis result for SHA-256 d24810c3cb7e7d88…

MALICIOUS

PDF

94.8 KB Created: 2021-03-29 22:49:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: a48b20e295659e2307f092d52631ed88 SHA-1: ea428e00d52df66d878c577c611058d2aa719efb SHA-256: d24810c3cb7e7d88aee923841c4e3e3f2d4c4da35d6cd489fb3fb047ed103dc0
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, with ClamAV specifically flagging it as a phishing trojan. The embedded URLs suggest a tactic to redirect users to potentially malicious or SEO-manipulated content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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/award?keyword=apostila+para+aprender+frances+pdf PDF link annotation
    • https://cdn.sqhk.co/vavapezami/hejijf5/58249175559.pdfIn PDF document text
    • https://cdn.sqhk.co/dekaroku/383ic5p/fonerawosorifosotuwu.pdfIn PDF document text
    • http://scoretdho.best/chartek_1709_data_sheet8rvqn.pdfIn PDF document text
    • https://cdn.sqhk.co/boxepupovemu/cif7hfL/kekolokojamafumafu.pdfIn PDF document text
    • https://cdn.sqhk.co/dewozoju/bFijwJF/memiwifexi.pdfIn PDF document text
    • https://cdn.sqhk.co/vawapisoxe/fheghjh/sticker_maker_whatsapp_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/xixujipum/ihXihjc/portable_soccer_dx_full_version_free_download.pdfIn PDF document text
    • http://worldhold.online/wagujaxugimamovuwetojuft5bbf.pdfIn PDF document text
    • https://cdn.sqhk.co/givesaxi/ihpkjjE/telepigorumowinepowa.pdfIn PDF document text
    • https://motutipe.weebly.com/uploads/1/3/4/6/134674000/5322160.pdfIn PDF document text
    • http://unosital.space/nibajewevakigumigubotonevo8m.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414335/normal_603de4d718bff.pdfIn PDF document text
    • https://jipidonano.weebly.com/uploads/1/3/4/3/134340070/delasa-kimon-negebezaj.pdfIn PDF document text
    • http://investorlands.ru/youtube_pinoy_channel_tv_todaylhjbj.pdfIn PDF document text
    • https://cdn.sqhk.co/gixedomawa/re8hgii/never_have_i_ever_imdb_trivia.pdfIn PDF document text
    • https://cdn.sqhk.co/liminekaj/jhbSKcS/dibexatanipemu.pdfIn PDF document text
    • http://igcopyrightclient.com/download_game_stick_war_3_mod_apk7flww.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465263/normal_60520a36ca351.pdfIn PDF document text
    • http://fukuzowi.sportsontheweb.net/82175653436.pdfIn PDF document text
    • https://pitatulepuz.weebly.com/uploads/1/3/2/3/132303378/8420250.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491686/normal_5fd8164082052.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389599/normal_604b8d5fba8b3.pdfIn PDF document text
    • http://kirakexig.mypressonline.com/do_you_capitalize_presidential_election.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xuvekixofeku.onlinewebshop.net/1763647605.pdfIn PDF document text
    • http://sazasewugekupej.onlinewebshop.net/how_do_you_light_the_pilot_light_on_a_hotpoint_gas_stove.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001126c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1126C 5140 bytes
SHA-256: 59491ff46eae4e4acc9b8456f241c026be650215a46d68e271b52fe0e04213d1
font_01_sfnt_off000123ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123EF 1800 bytes
SHA-256: a36eee06fef6ce219692c4ec918276ac99413e4fd1e3666e4031624f9289d620
font_02_sfnt_off00012c7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C7C 13244 bytes
SHA-256: 9ac3c9b8f4523c6c118d97b3b9ad427eb11800b3ef662cf8ba80dff96a3d646b
font_03_sfnt_off000154de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x154DE 16448 bytes
SHA-256: d473d2ce7cb349c0e507cd16163c0ca2bca30ebfe7a00a562a0cf8f2f41f2742

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