Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c9dd83be057735d…

MALICIOUS

PDF

75.0 KB Created: 2021-02-15 15:37:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 4f64cbaac604934847d9296a48c53f39 SHA-1: 5164b6527b38b7f203eab6437f1e31e8be9fb016 SHA-256: 0c9dd83be057735d9e51b45b5764a34a4ed3be1fa66c3e0d835647cd03dc958d
126 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, one of which is presented as a search result for free PDF downloads, indicating a social engineering lure. The PDF also utilizes a link farm strategy on disposable hosting, further suggesting malicious intent to redirect users to potentially harmful content.

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://jottigo.ru/strik?utm_term=manage+your+day+to+day+pdf+free+download PDF link annotation
    • https://cdn.sqhk.co/ruvatagukas/xicgfQZ/zavitedemamesavugoxumor.pdfIn PDF document text
    • http://lorenbayi.com/html_button_formaction_attribute9lvj6.pdfIn PDF document text
    • http://rineset.xyz/essay_topics_for_college_students_with_answers9eiry.pdfIn PDF document text
    • https://cdn.sqhk.co/dawadetugas/itphbhc/simple_one_page_business_plan_template_free.pdfIn PDF document text
    • https://cdn.sqhk.co/zebenane/ImifCid/tepolokovisukekapedi.pdfIn PDF document text
    • https://tigasuzile.weebly.com/uploads/1/3/1/3/131379741/cd63faab5.pdfIn PDF document text
    • https://sunuxima.weebly.com/uploads/1/3/5/3/135324667/8c6f7b344c4f8cd.pdfIn PDF document text
    • https://cdn.sqhk.co/konafomaz/ghiiie5/total_party_kill_level_47.pdfIn PDF document text
    • http://bunnygummy.ru/zuvejebijixisukogibebijfca9.pdfIn PDF document text
    • https://cdn.sqhk.co/disumuneriva/jgdjqhc/51549170548.pdfIn PDF document text
    • http://pinerapidsrr.com/186467532400l23g.pdfIn PDF document text
    • http://bachanalytics.com/botella_de_leydenzz9am.pdfIn PDF document text
    • https://dojibabebane.weebly.com/uploads/1/3/2/6/132682208/wusas-panofejizejepa-repuwi-wulalononofo.pdfIn PDF document text
    • https://cdn.sqhk.co/sejejajoxej/ghfghii/offroad_car_lx_apk.pdfIn PDF document text
    • https://jesidovelagira.weebly.com/uploads/1/3/4/7/134705211/4680725.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fowowoge.rf.gd/severe_asthma_guidelines_australia.pdfIn PDF document text
    • http://javirukegeg.rf.gd/household_budgeting_templates.pdfIn PDF document text
    • http://juvegebufu.epizy.com/lawuzawisodizinozafi.pdfIn PDF document text
    • http://rapabilalame.rf.gd/converting_metric_units_worksheet_year_5.pdfIn PDF document text
    • http://ragomoxos.rf.gd/loxewekumazalazenere.pdfIn PDF document text
    • http://vinepefep.rf.gd/jumping_ball_games_free.pdfIn PDF document text
    • http://nejesinila.epizy.com/26851469079.pdfIn PDF document text
    • http://ponuruv.rf.gd/dragon_city_breeding_sanctuary_level_2_guide.pdfIn PDF document text
    • http://garopawugalil.rf.gd/newefatujin.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_off0000e866.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE866 5228 bytes
SHA-256: 03cdff43ccc31f472ba31aaf4dfe1224b2b3b6c4034f8adb720402f32e629339
font_01_sfnt_off0000fa68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA68 10484 bytes
SHA-256: 306d920ab9ae9e8b5758076e9d3b900dd330699b274d3abc8c2a4fca9b353bdc

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