Malicious PDF — malware analysis report

Static analysis result for SHA-256 58c8140b09e82cce…

MALICIOUS

PDF

72.7 KB Created: 2021-02-26 23:43:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 08dde91be220f43f35d1f13675a72661 SHA-1: 7594f6c84692266bbc758a2e62147397c512ea02 SHA-256: 58c8140b09e82cce3eca087b3744df72dfa03e762d4d776e8871c6e02edd4f32
166 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It contains numerous embedded URLs, some of which are presented as invisible links within the document, designed to redirect users to suspicious domains. The document body, though heavily obfuscated, suggests a lure related to educational summaries, likely to trick users into clicking the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • Image-heavy PDF with invisible link to suspicious domain high PDF_SUSPICIOUS_LINK_LURE
    PDF is a small image-heavy lure with invisible link annotations that send the user to a suspicious high-risk-domain URI. This matches credential-phishing carriers where the visible document is only a prompt and the real collection flow happens on the linked website.
  • 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://seumenha.ru/strik?utm_term=how+to+write+a+summary+for+grade+3 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4378852/normal_5fd6584fe3cef.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367944/normal_5ffc93d700474.pdfIn PDF document text
    • http://lnstagramverifiedbadge-form.com/90112308211s256e.pdfIn PDF document text
    • http://gedadekenoz.mywebcommunity.org/crane_cool_mist_humidifier_no_mist_pads.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460465/normal_600efb2343376.pdfIn PDF document text
    • http://bumumapa.mypressonline.com/ka24de_transmission_code.pdfIn PDF document text
    • https://cdn.sqhk.co/fukonovum/gQaUiey/battle_souls_mod_apk_unlimited_money.pdfIn PDF document text
    • http://lnstagram-support.live/atrial_fibrillation_nice_guidelineqdibm.pdfIn PDF document text
    • http://kinemulawaw.sportsontheweb.net/46834373328.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416938/normal_6035cf5e8b699.pdfIn PDF document text
    • https://cdn.sqhk.co/durotula/WRkjfhh/recarga_facil_vivo_apk.pdfIn PDF document text
    • http://sibuvre.com/bivobixeja1hmh.pdfIn PDF document text
    • http://wisecreditscore.info/rotukojepubapiwegemibao0ri.pdfIn PDF document text
    • http://riwotivadejud.sportsontheweb.net/what_can_you_do_with_a_computer_networking_degree.pdfIn PDF document text
    • https://cdn.sqhk.co/lewulula/XhaO9jf/sitasexatigas.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366003/normal_5ff676417c91b.pdfIn PDF document text
    • http://tafugegajotu.mygamesonline.org/bebupavakogaw.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gijabakupukuj.rf.gd/deadly_betrayal_movie_free.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_off0000e097.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE097 5516 bytes
SHA-256: c9a6d4b11e7afa027516a3aa8707047a109a7dc09bdda401b7130498ed34a458
font_01_sfnt_off0000f35d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF35D 10008 bytes
SHA-256: a504d53691393a59d56cf234124a71b1443c9773369ed8e4e6eaa34f6680eb52

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