Malicious PDF — malware analysis report

Static analysis result for SHA-256 18c7dac5e41d97b9…

MALICIOUS

PDF

77.7 KB Created: 2021-03-13 21:26:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 6d3d0b18ade448b05d1ac11367c77377 SHA-1: 2f974a83514a8872d189d55df0a10b82848d6876 SHA-256: 18c7dac5e41d97b9b148e9879badbe9cbe98251032944a5517ce2bbdfe5c3d48
126 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of numerous external URIs, many hosted on disposable domains, suggests a phishing or malware distribution campaign. The document body, though heavily obfuscated, contains metadata related to 'marriage proposal letter pdf' and 'wkhtmltopdf', hinting at a social engineering lure to disguise the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://kuzutuzo.ru/123?utm_term=marriage+proposal+letter+pdf PDF link annotation
    • https://xesanojazal.weebly.com/uploads/1/3/0/9/130968931/6e0d177f.pdfIn PDF document text
    • http://kayikciakademi.com/padufaraxaxodebirapofnvpiv.pdfIn PDF document text
    • http://zdorovie-vashe-vse.xyz/zuzegexel3uy6g.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488102/normal_5fe6b50b3d066.pdfIn PDF document text
    • https://wubedalenab.weebly.com/uploads/1/3/1/3/131383767/1961563.pdfIn PDF document text
    • http://paksorond.xyz/baldur_gate_dark_alliance_2_workshop_guideu2spq.pdfIn PDF document text
    • http://sosed.market/6025821124lo6np.pdfIn PDF document text
    • https://modotetizifoxi.weebly.com/uploads/1/3/1/6/131637555/zidobu-nukozimixadi-kokojifev.pdfIn PDF document text
    • https://borerejo.weebly.com/uploads/1/3/4/0/134040615/xudufofogezopa.pdfIn PDF document text
    • http://teguruta.medianewsonline.com/audit_report_of_infosys.pdfIn PDF document text
    • http://meblik.su/assign_multiple_roles_in_wordpressoytf7.pdfIn PDF document text
    • http://reduslimitalia-official.site/4329275689v4hvl.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471249/normal_5ff61262c241f.pdfIn PDF document text
    • http://doucheop.xyz/3564618057r4brw.pdfIn PDF document text
    • http://kfnwejfnkwheklf.space/media365_book_reader_pro_apkuvghg.pdfIn PDF document text
    • https://gamekesilib.weebly.com/uploads/1/3/4/8/134892139/43951b.pdfIn PDF document text
    • https://lumovomudin.weebly.com/uploads/1/3/4/7/134704265/9bb8fd8.pdfIn PDF document text
    • https://pefikasulanak.weebly.com/uploads/1/3/4/3/134350375/9863925.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bavatesivo.myartsonline.com/how_to_make_artisan_bread_rolls.pdfIn PDF document text
    • http://ligujizulogi.atwebpages.com/the_alliance_system_lead_to_world_war_1.pdfIn PDF document text
    • http://fegoluvarelewum.myartsonline.com/syncrowave_250_pulser.pdfIn PDF document text
    • http://pozijawikubinun.myartsonline.com/what_is_the_learn_button_on_liftmaster_garage_door_opener.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_off0000f203.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF203 5216 bytes
SHA-256: 48e27901eed4e1ae90e5e88f5ef79ada2403b80478e80ab3ef33cda68526d9c4
font_01_sfnt_off000103dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103DD 11004 bytes
SHA-256: 44a218d2ea7fe9b1ad829c063b2c3ad98366abf9b2ca240278735c25a70e1aa6

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