Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c6d5aa0c3e48f93…

MALICIOUS

PDF

89.6 KB Created: 2021-03-24 21:09:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: ef7f02ae720ed1fe993c0178d831e414 SHA-1: c50a51439f346875eb5a0c45635591e3f9e7f9f6 SHA-256: 3c6d5aa0c3e48f93ecdd93f0b5d82352dcad41cbdfaea1ad05fc1fc32081fd7a
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://vilenefex.ru/strik?utm_term=how+to+get+books+app+on+mac PDF link annotation
    • http://warowusavi.mywebcommunity.org/telecharger_bescherelle_grammaire_anglaise_gratuit.pdfIn PDF document text
    • http://yachts-4-sale.com/best_survival_movies_on_primec5qrp.pdfIn PDF document text
    • http://faxusigeroles.sportsontheweb.net/tiwatezivedesaxelevuba.pdfIn PDF document text
    • http://lomipojiposo.iblogger.org/what_kind_of_phone_charger_does_a_galaxy_s9_use.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478415/normal_60124f6c77880.pdfIn PDF document text
    • https://wekupadafar.weebly.com/uploads/1/3/5/3/135315244/a04f65b7.pdfIn PDF document text
    • http://1xbets-reg.site/bayonet_charge_poem_analysisbo1e7.pdfIn PDF document text
    • https://ruwatija.weebly.com/uploads/1/3/4/8/134846771/japejeke_sejulave.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448551/normal_5ff27ac5c2c1f.pdfIn PDF document text
    • http://bandalet.club/joe_defranco_workout59t4r.pdfIn PDF document text
    • http://bikejesoxatelo.mygamesonline.org/2020_epi_week_calendar.pdfIn PDF document text
    • https://virataxutepubom.weebly.com/uploads/1/3/0/8/130874282/tixid_pasibi_pawujerurexu_jivorogugejo.pdfIn PDF document text
    • http://mukinumatonewo.getenjoyment.net/68999658584.pdfIn PDF document text
    • http://rastet-malysh.ru/seagate_backup_plus_srd00f2_driverdzvn9.pdfIn PDF document text
    • https://lubozukutiximik.weebly.com/uploads/1/3/4/4/134472848/8de002f05538e9.pdfIn PDF document text
    • http://sabumow.mygamesonline.org/lasko_digital_ceramic_tower_heater_walmart.pdfIn PDF document text
    • http://help-service-support.com/saints_row_2_xbox_360_cheatsv8f79.pdfIn PDF document text
    • https://buwupejobo.weebly.com/uploads/1/3/4/2/134265589/4333964.pdfIn PDF document text
    • http://konujojijitezu.iblogger.org/92048983788.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sedopati.epizy.com/stranger_things_episode_2_parents_guide.pdfIn PDF document text
    • http://bupebubu.epizy.com/larson_algebra_2.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_off00012009.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12009 5380 bytes
SHA-256: b1c331e626ca96f2d6b970c50a46d6f045f140adbd47699de5232783f7145118
font_01_sfnt_off00013266.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13266 11032 bytes
SHA-256: 752973b9aa000344107300390c291e73b6036f4bd18f6da773b625b6024cd4d3

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