Malicious PDF — malware analysis report

Static analysis result for SHA-256 c808c8ff802b7f5a…

MALICIOUS

PDF

76.1 KB Created: 2021-05-16 11:52:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: c2818b7c42bae494e58b26edcfb60d01 SHA-1: 24f79a742350a1ef146d6f74e5e7531abd0a7cef SHA-256: c808c8ff802b7f5af20328a17ca30b6b0e41cc8569454e16800affe42abeb7c4
146 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm and employs a callback lure, prompting users to contact a number for issues like billing or refunds. While no scripts were directly extracted, the presence of multiple external URIs suggests a phishing or social engineering attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://pelibifir.ru/strik?utm_term=sat+subject+test+dates+2020-21 PDF link annotation
    • https://cdn.sqhk.co/buwuvibija/gdjbifD/8345180455.pdfIn PDF document text
    • http://dimax.website/5347702031703oqt.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4527902/normal_605646f4879f1.pdfIn PDF document text
    • http://parovosi.mygamesonline.org/type_2_diabetes_statistics_canada.pdfIn PDF document text
    • http://instapriz24.site/operating_life_cycle_costyn1mw.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4371272/normal_5ffff35dd640f.pdfIn PDF document text
    • https://cdn.sqhk.co/nifijagik/d3ZidLG/63959610008.pdfIn PDF document text
    • http://on-arenas.com/6927132298u90xo.pdfIn PDF document text
    • http://shop-kid-toys.online/cod_world_at_war_zombies_cheats_ps3wp63r.pdfIn PDF document text
    • http://ruzamaji.getenjoyment.net/receptionist_self_evaluation_form.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405925/normal_5fd68b7fd5350.pdfIn PDF document text
    • https://cdn.sqhk.co/lewikokezina/hcihhjS/miners_settlement_open_world_idle_clicker_games_unblocked.pdfIn PDF document text
    • http://kasijeran.iblogger.org/curved_corrugated_roofing_sheets_uk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rususekobijo.myartsonline.com/razer_blackwidow_ultimate_keyboard_not_working.pdfIn PDF document text
    • http://nemenarubaz.atwebpages.com/stay_hungry_stay_foolish_rashmi_bansal_download.pdfIn PDF document text
    • http://pejaxuvotovu.rf.gd/zamajotitepuvedumor.pdfIn PDF document text
    • http://xogijowag.onlinewebshop.net/guzesotuzuvemupubiwe.pdfIn PDF document text
    • http://tizedukef.epizy.com/jackbox_party_pack_3_answers.pdfIn PDF document text
    • http://zoxalojidud.epizy.com/farberware_single_serve_k-cup_brew_coffee_maker_manual.pdfIn PDF document text
    • http://wujipimasedol.epizy.com/fejuremit.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_off0000e9f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9F8 5484 bytes
SHA-256: ffc66860731f3eb9fbc1a2b82751d1774ed0f99c88818ee4d21be00dfe5964fe
font_01_sfnt_off0000fcb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCB9 10764 bytes
SHA-256: de70b816ad4d2a7690aea12e1efb97a889dade74e4c4ac6d481dc490fd8171ea

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