Malicious PDF — malware analysis report

Static analysis result for SHA-256 acc660f428e9595a…

MALICIOUS

PDF

77.7 KB Created: 2021-03-22 09:38:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: b4e1c3dab9eed671fefe4ae1f30244db SHA-1: 623d908c1e1f9f684346fe8cd3f5f70f89436131 SHA-256: acc660f428e9595af40ef67dda855335ef1993edea1398bda4529f2e376039c5
126 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. It contains numerous external URLs, many hosted on disposable domains, indicating a link farm designed to redirect users. The presence of 'utm_term' parameters suggests tracking or campaign-specific lures, common in phishing and malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://zajinet.ru/123?utm_term=bed+wars++game PDF link annotation
    • https://cdn.sqhk.co/rotusorukazi/hgiAgcy/metformin_dose_for_metabolic_syndrome.pdfIn PDF document text
    • http://gejesixave.scienceontheweb.net/paramed_wrist_blood_pressure_monitor_manual.pdfIn PDF document text
    • http://gapokaro.mywebcommunity.org/aims_and_objectives_of_islamic_education.pdfIn PDF document text
    • http://fuvisetitisenon.mypressonline.com/5581683371.pdfIn PDF document text
    • http://betijeduw.getenjoyment.net/44779509231.pdfIn PDF document text
    • http://vutatux.22web.org/siwinotusodu.pdfIn PDF document text
    • http://numulul.mygamesonline.org/26202384182.pdfIn PDF document text
    • https://cdn.sqhk.co/bufomofa/hdie1Qp/absence_notice_template.pdfIn PDF document text
    • https://cdn.sqhk.co/rivitovolu/hg10JpJ/midge_fly_larvae_in_drinking_water.pdfIn PDF document text
    • http://pavedewono.iblogger.org/overlord_light_novel_volume_12.pdfIn PDF document text
    • https://cdn.sqhk.co/lagitesavap/lgcyfYi/60501797994.pdfIn PDF document text
    • http://nutetuxiv.mygamesonline.org/central_park_5_interrogation_techniques.pdfIn PDF document text
    • https://cdn.sqhk.co/rukefazox/bBihYa9/fekukepuvunid.pdfIn PDF document text
    • http://nuvagefo.medianewsonline.com/lisemegetija.pdfIn PDF document text
    • http://gudibetujem.iblogger.org/ride_the_tiger_lyrics_dio.pdfIn PDF document text
    • https://cdn.sqhk.co/livukigelo/jhfjehi/radiation_island_free_apk_obb.pdfIn PDF document text
    • https://cdn.sqhk.co/foxezevewa/ii3jhee/design_line_knifeless_tape_3m.pdfIn PDF document text
    • https://cdn.sqhk.co/budajawisore/wLjgMRJ/71458762682.pdfIn PDF document text
    • http://zemesod.getenjoyment.net/nomenclature_of_bicyclic_and_spiro_compounds.pdfIn PDF document text
    • http://wusozupu.mypressonline.com/93278544496.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://natixiluv.rf.gd/pdf_askeb_abortus_inkomplit.pdfIn PDF document text
    • https://s3.amazonaws.com/fovezewi/chain_reaction_2_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/tasufagijaremo/boss_dr-3_review.pdfIn PDF document text
    • http://fubegamo.epizy.com/54893713797.pdfIn PDF document text
    • https://s3.amazonaws.com/kovezodepugov/puzzle_and_dragons_beginner_guide_2019.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_off0000f25a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF25A 5252 bytes
SHA-256: 6fff399635621f32bb43e7546aab5825384a7decf76ddfa1fde741b695eb4e4e
font_01_sfnt_off00010438.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10438 11008 bytes
SHA-256: 9b5fec46b09efbbe2fe463d22b112973f069ec44bf760b9769a5949867da885f

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