Malicious PDF — malware analysis report

Static analysis result for SHA-256 09540f373f5cb333…

MALICIOUS

PDF

86.6 KB Created: 2021-04-20 21:59:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 3099af2e8b8ff2e211c00d569859e06e SHA-1: 7c620f014167e98011996641c1627ae7631f1f9b SHA-256: 09540f373f5cb33363ddadf79f049ebf063d13c7f9dc8513d0c4443f203f0ec2
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged by ML classifiers and ClamAV as malicious phishing content. The document body, though heavily obfuscated, appears to be a lure related to search queries, directing users to external links. The presence of multiple external URIs and the link farm heuristic indicate a phishing or redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://dugedepap.ru/strik?utm_term=what+is+the+density+of+cement+in+kg+m3 PDF link annotation
    • http://all-gopro.com/how_to_unlock_craftsman_circular_saw0k20k.pdfIn PDF document text
    • https://cdn.sqhk.co/loganidob/hjd7eD5/60426840897.pdfIn PDF document text
    • http://activa-fb.com/zadusupovimifagojtjnk.pdfIn PDF document text
    • https://cdn.sqhk.co/sesudegaruta/gfDRTsc/toruparapakuvuzipikit.pdfIn PDF document text
    • http://fosufupivufup.66ghz.com/xivowenuxasonuvu.pdfIn PDF document text
    • https://cdn.sqhk.co/lepavenujal/ihSBMSl/jefopudazedeta.pdfIn PDF document text
    • http://sallehq.xyz/6275999019040ije.pdfIn PDF document text
    • https://cdn.sqhk.co/baxoladipezu/tKhaiid/snakehead_fish_have_teeth.pdfIn PDF document text
    • https://cdn.sqhk.co/sipebesoxu/CbT1ghp/everfi_module_5_credit_scores_answers.pdfIn PDF document text
    • https://cdn.sqhk.co/neruxojus/ighejcM/xemumaloje.pdfIn PDF document text
    • https://cdn.sqhk.co/wejideduv/atmkxt9/sobodi.pdfIn PDF document text
    • https://cdn.sqhk.co/zajujinul/YAHHagg/fowawat.pdfIn PDF document text
    • https://cdn.sqhk.co/jawubibegeba/9jePyeR/xadagefugisezi.pdfIn PDF document text
    • https://cdn.sqhk.co/tuwetebep/u8QUgjn/mechanic_shops_near_me_open_tomorrow.pdfIn PDF document text
    • http://igclienteam.com/estructura_texto_argumentativo_expositivo4cifr.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xofuzugavup.epizy.com/pujepe.pdfIn PDF document text
    • http://didaduxazej.epizy.com/manual_auger_style_post_hole_digger.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2d75424f-5a9a-49fb-bed3-afa2dff4ec55/chess_puzzles_learning_app.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d00bcdae-558e-4083-a48f-1f063a652acc/sidizi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/75fc009d-0467-4fd4-bd6f-3fc6c36a1b4f/2004_dodge_ram_1500_light_bulbs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/75b8d96e-f2a8-42ea-b30a-43341f0d2330/what_is_the_crucible_about_summary.pdfIn PDF document text
    • https://s3.amazonaws.com/somisilegex/lixiledavelul.pdfIn PDF document text
    • http://ludumidajite.rf.gd/new_moon_july_2020_time.pdfIn PDF document text
    • https://s3.amazonaws.com/marimejerebo/state_of_illinois_cants_form.pdfIn PDF document text
    • https://s3.amazonaws.com/dudigonifu/6_digit_place_value_worksheets.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fdb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDB2 5648 bytes
SHA-256: ef4ec9e3b24b8ff34745fa1c12d0b6b74b0aa68d635545a37892039e2eed0575
font_01_sfnt_off000110e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110E3 11320 bytes
SHA-256: c468f6b7a73df095b078a8f0b5a39bd4b26865e62b8e82cf094d4ae20521aacd
font_02_sfnt_off00013795.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13795 16068 bytes
SHA-256: 2e6efdb6ec6b06881b73571a6dc11127da1b4fc0f11d045bd7c2e12cbfc92ea6