Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f1f6bcdbfcab815…

MALICIOUS

PDF

74.1 KB Created: 2021-04-14 12:23:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: afe19c35b4e6751670844c543338233f SHA-1: 5e9cfa9ec79e0895559bbb43651c515a6b34e8d8 SHA-256: 8f1f6bcdbfcab815eab93ad9dcd93c23ad292270bee0627cb2e2016f0470527d
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which are associated with link farms and disposable hosting, indicating a phishing or malicious redirection scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to direct users to phishing sites. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a spearphishing attachment used to deliver users to malicious content.

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://xajibur.ru/strik?utm_term=11+plus+vocabulary+cartoons+pdf PDF link annotation
    • http://shop-onlain.fun/zuredowipakitixovwtdhp.pdfIn PDF document text
    • http://chelamela.org/295382561767to2k.pdfIn PDF document text
    • http://erogan-columbia.site/kenmore_elite_dryer_not_drying_properlybkemd.pdfIn PDF document text
    • http://noverst.xyz/opendiag_mobile_2._17._2_downloadxurxh.pdfIn PDF document text
    • http://lapiwudoxavov.scienceontheweb.net/blonde_roots_bernardine_evaristo.pdfIn PDF document text
    • http://stat-index-co.com/wixurugijutijp3m.pdfIn PDF document text
    • http://wamabivunufoteg.medianewsonline.com/ielts_reading_task_1_academic_answer_sheet.pdfIn PDF document text
    • http://circus.market/strickvorlagen_baby_gratislkh02.pdfIn PDF document text
    • http://top-odejda.com/secret_of_mana_2_rom_deutschlbcys.pdfIn PDF document text
    • http://xumupizaxuto.scienceontheweb.net/zusurakuvoseledaramuso.pdfIn PDF document text
    • http://idealica-itufficiale.website/how_deep_is_a_septic_drain_field8ad5o.pdfIn PDF document text
    • http://healthytrands.com/brewster_ma_weather_reportiigw3.pdfIn PDF document text
    • http://kyrgyztours.com/dulfy_deimos_guide095se.pdfIn PDF document text
    • http://astrology-personal.online/manual_teclado_yamaha_dgx-230_em_portuguesmlabe.pdfIn PDF document text
    • http://psyhologrzn.ru/67952839964yqxu4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bebamefuveb.rf.gd/free_anthony_robbins_unlimited_power.pdfIn PDF document text
    • http://nubibubimalepik.atwebpages.com/black_dog_led_zeppelin_tab.pdfIn PDF document text
    • http://mifivanotelo.rf.gd/buwomutev.pdfIn PDF document text
    • http://fimuwudefixolet.epizy.com/supejubotivolo.pdfIn PDF document text
    • https://s3.amazonaws.com/zosevid/how_to_reprogram_a_chamberlain_garage_door_keypad.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_off0000e1b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1B8 5408 bytes
SHA-256: dbaaadb860e41401e4e7e664672da95209c456f966c43947f00d12cca6acb8cf
font_01_sfnt_off0000f435.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF435 11056 bytes
SHA-256: 1937bdb461e0b5a821e3d24e6a03dbf1cb0db86fd3e12a616dfb4beb88f2d0da

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