Malicious PDF — malware analysis report

Static analysis result for SHA-256 71803e3b9e8f4344…

MALICIOUS

PDF

74.8 KB Created: 2021-03-04 14:43:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 3d9a93ce7a3d6fce8749e0e81c47ee97 SHA-1: 5711567db3d42983347cc6ac82fe5208985d8fbe SHA-256: 71803e3b9e8f43445b8cecfc6529a551850108fe5a1f5bac2940df0af706ea61
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to disposable domains and are likely part of a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The document body, though heavily obfuscated, suggests a lure related to search queries.

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://jottigo.ru/award?keyword=what%2527s+the+healthiest+thing+to+eat+at+wendy%2527s PDF link annotation
    • http://regvoolkim.website/p1lan.pdfIn PDF document text
    • http://sreview.online/dremel_bits_guidegeip9.pdfIn PDF document text
    • http://prodson.fun/kevopevobozifofukun3o2.pdfIn PDF document text
    • http://jigikujed.scienceontheweb.net/69200354805.pdfIn PDF document text
    • http://vojiwilobir.22web.org/borotuvazidi.pdfIn PDF document text
    • http://lovojat.22web.org/how_to_run_assembledebug_in_android_studio.pdfIn PDF document text
    • http://app-3null.com/100_deadly_skills_survival_edition_downloadvbeza.pdfIn PDF document text
    • http://dogalijun.scienceontheweb.net/cuantos_mm_equivale_un_km.pdfIn PDF document text
    • http://zikifogomi.22web.org/acta_constitutiva_de_una_asociacion_civil.pdfIn PDF document text
    • http://tiktokfrance.fun/panasonic_kx-tg9581_handsetrf3b4.pdfIn PDF document text
    • http://veruvipavopa.getenjoyment.net/remington_700_adl_bdl_difference.pdfIn PDF document text
    • http://lnstagramverifiedsbadgesforms.com/comedy_world_character_creator_vyondxqy51.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rulumagevamed.epizy.com/spread_spectrum_communications_handbook.pdfIn PDF document text
    • https://s3.amazonaws.com/fajeloninesitel/begosifiviwinof.pdfIn PDF document text
    • http://setopuvoxuz.epizy.com/kejolumepexosevazuvesiras.pdfIn PDF document text
    • http://wowawese.rf.gd/panegosewuxiv.pdfIn PDF document text
    • http://rulenanevatetid.epizy.com/mendelian_genetics_practice_problems.pdfIn PDF document text
    • http://badubitoj.epizy.com/sibekepenun.pdfIn PDF document text
    • https://s3.amazonaws.com/rabewiruzitewa/74318030134.pdfIn PDF document text
    • https://s3.amazonaws.com/bufexa/bsg_colonic_polyp_guidelines.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_off0000e7d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7D7 5232 bytes
SHA-256: 0f6c6e7a423c1bd106c08a4ae3573158c8813b7056063197c177e78311692e87
font_01_sfnt_off0000f9c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9C6 10412 bytes
SHA-256: f3ffd14b791798a698874bb28c657f47cd1d31ca094c20936e4e62735915020e

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