Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ecc1639d76bccc9…

MALICIOUS

PDF

69.9 KB Created: 2021-02-22 06:06:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 307ca3e109dcbda3f363135999d7eb6b SHA-1: 17fcf49500080659fa14518204d030a37ce0f1e3 SHA-256: 5ecc1639d76bccc93fadfefeef94a9168f3c835d73d2bc99649a8203ba931a9f
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains multiple embedded links, with at least one pointing to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The document body, though heavily obfuscated, appears to be a lure related to a manual or template, aiming to trick users into clicking the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/wix?keyword=arizer+extreme+q+manual In PDF document text
    • https://cdn.sqhk.co/pinepopowig/RgiPiaf/wotebakefomosub.pdfIn PDF document text
    • https://cdn.sqhk.co/mepetiruzi/fy3rUhh/archery_games_shooting_balloons.pdfIn PDF document text
    • http://luminar4-download.xyz/applied_behavior_analysis_3rd_edition2lhd3.pdfIn PDF document text
    • https://wexarasi.weebly.com/uploads/1/3/4/3/134351888/fereke.pdfIn PDF document text
    • https://bolubevegu.weebly.com/uploads/1/3/1/4/131454373/tewuju-fomeno.pdfIn PDF document text
    • http://pumba-timon.space/259056662661h5hd.pdfIn PDF document text
    • http://mscredit.info/jeu_de_carte_a_2_gin_ramipv72h.pdfIn PDF document text
    • http://podipotekoi.ru/21827325195uq7ki.pdfIn PDF document text
    • http://lujoxowuri.iblogger.org/apartment_lease_form_chicago.pdfIn PDF document text
    • https://fozuxuvaporoj.weebly.com/uploads/1/3/1/8/131856883/3944694.pdfIn PDF document text
    • https://cdn.sqhk.co/dirotiweze/egbNiog/campus_date_sim_vip_photos.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366035/normal_6029de2f6a0a9.pdfIn PDF document text
    • https://cdn.sqhk.co/difigobon/ghvbuSg/learn_spanish_homestay_south_america.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gafibis.epizy.com/staples_8_tab_printable_divider_template.pdfIn PDF document text
    • http://sikapatosibo.rf.gd/ciccarelli_psychology_4th_edition_chapter_1.pdfIn PDF document text
    • http://kiduxoz.epizy.com/72905225753.pdfIn PDF document text
    • https://s3.amazonaws.com/vuzufexarevima/rasadefojapoxosa.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_off0000d6d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6D1 4884 bytes
SHA-256: 2f65291c3b2cdd27fdfb0c974b07d047590eb7b8f340f52966029c14f3ce1aa1
font_01_sfnt_off0000e762.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE762 10424 bytes
SHA-256: 82db557dd21a13686dfe1ebd07b2b5c9dd435ffc0fb9020680d465e6e53a336f

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