Malicious PDF — malware analysis report

Static analysis result for SHA-256 688427bdb202c74e…

MALICIOUS

PDF

82.7 KB Created: 2021-06-12 21:48:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 1e7ee7bc6f7dda365d312232e3eece03 SHA-1: 8ba9403aaf0b3eeb1d5a6e412c98ce18ed7db6c0 SHA-256: 688427bdb202c74e5c99cda6bc7f8a3d7353296a99a145efc4561194408744fe
126 Risk Score

Malware Insights

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

The PDF file contains heuristics indicating it is a link farm and has been flagged as malicious by ML classifiers and ClamAV. The document body, though heavily obfuscated, contains text related to a 'free download free fire hack version', suggesting a phishing or scam lure. The embedded URL points to a domain that appears to be part of this lure, likely leading to the download of a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://ketchas.ru/pbw?utm_term=free+download+free+fire+hack+version PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4482623/normal_5ffe547c25c48.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495058/normal_603419ea2739b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486054/normal_60476cbd90694.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380230/normal_60c1240f06e7b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464314/normal_60c1ad49812d5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470553/normal_6022916eba9dd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392649/normal_5fc99122c4fd5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/e0f768c7-6f45-49a9-ba1f-0fb010f3ec6a/hoover_spinscrub_50_fix.pdfIn PDF document text
    • http://natizasex.pbworks.com/w/file/fetch/144570837/digugisezadusiku.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6cf5a232-4bd3-4126-8c9e-320fc3b563ee/83186395225.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f3ce2273-a1a6-4b2b-9512-614df9d8e32c/pupifusisu.pdfIn PDF document text
    • http://giribuv.pbworks.com/f/xakupiwulisape.pdfIn PDF document text
    • http://risanafupek.pbworks.com/f/randomizer_pokemon_fire_red_rom.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/98e361f2-f811-4ff1-9eb3-5158db896c57/idylis_air_purifier_ac-2123_replacement_filter.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f667f5cd-7882-47fc-9285-59d356bcc3b4/92580327480.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/20665781-52dd-455b-b150-bffffbcfe3b7/how_to_calculate_the_turbine_efficiency.pdfIn PDF document text
    • http://wiwudoje.pbworks.com/f/christian_character_bible_study.pdfIn PDF document text
    • http://fatakalewene.pbworks.com/f/simple_ions_worksheet_answer_key.pdfIn PDF document text
    • http://wusagem.pbworks.com/w/file/fetch/145196190/kanji_dictionary_2500.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c29a2fee-7979-44e7-80a6-b86a076cd8b5/vetodanotedinejulujes.pdfIn PDF document text
    • http://tawifem.pbworks.com/w/file/fetch/145102899/french_b1_vocabulary_list.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7ba7e8ff-d757-4d06-9d30-47b44bbad309/diguzofikorurepemaw.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_off0000f8e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8E6 5280 bytes
SHA-256: bbcee7f90900dfe25b1b2f7ed32fe4cbd4efb9dd705b6f19f92618cb80bd72c4
font_01_sfnt_off00010af1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AF1 22092 bytes
SHA-256: 85bd69626632c1ec0e1c0ae294092cf387f05a659080dbdf279bcd8361095edc