Malicious PDF — malware analysis report

Static analysis result for SHA-256 51518265bebf8d0f…

MALICIOUS

PDF

77.7 KB Created: 2021-03-21 23:15:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: aef2ef28556a3634a99a8a446e2300bc SHA-1: ee904547d180a096b391bc2e317dfb85384cc3f5 SHA-256: 51518265bebf8d0f6c0aeff903a2fc8f21fa3d4c41329ba124b7114bc1514792
166 Risk Score

Malware Insights

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

The sample was identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a phishing lure. The document body and heuristics indicate a redirection to external URLs, specifically mentioning payment or bank-related changes, which is a common tactic for business email compromise. The presence of numerous external links on disposable hosting further supports a malicious intent to redirect users to potentially harmful sites.

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
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • 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://resalured.ru/aws?utm_term=health+card+name+change+ontario+canada PDF link annotation
    • https://pamigewome.weebly.com/uploads/1/3/4/6/134631685/kotezifipikuxokera.pdfIn PDF document text
    • https://pudukodup.weebly.com/uploads/1/3/1/4/131407572/nirawapo.pdfIn PDF document text
    • http://itawegan.space/liximisepawidilorerilaymib0.pdfIn PDF document text
    • http://lokotahas.ru/wozagi7g6rv.pdfIn PDF document text
    • http://genoray.pro/3d_printable_face_mask_framemnuhv.pdfIn PDF document text
    • http://zabavnyi-slon.ru/ikea_malm_storage_bed_assembly_instructionsxfyat.pdfIn PDF document text
    • http://affilateapp.online/how_to_connect_afterglow_controller_to_nintendo_switch0prte.pdfIn PDF document text
    • http://ipatovaalena.ru/steven_universe_attack_the_light_apkp2kpz.pdfIn PDF document text
    • http://shoes-storie.club/42709561479c8uk.pdfIn PDF document text
    • http://white-x.fun/60985074554xfsdx.pdfIn PDF document text
    • http://supportcopyright.net/wahl_5-star_cordless_detailer_li_hair_trimmerzfsl0.pdfIn PDF document text
    • http://design-kvartira.info/biggie_smalls_it_was_just_a_dream_lyricsz44xz.pdfIn PDF document text
    • http://newsportstechnology.ru/22779933798o5tre.pdfIn PDF document text
    • https://temazojirilezin.weebly.com/uploads/1/3/2/3/132302863/f2354106a007e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/c3648c96-88e0-4c81-a0a1-090c4251aa47/58045545926.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eb597f74-e999-4952-8186-34474bd06edc/management_books_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c2ab8cdf-3fe5-4f9e-b9d9-a6db9ffe74b0/complex_analysis_gamelin_solutions.pdfIn PDF document text
    • https://92ddf5cc-4ce7-4caf-b117-8241c553a727.filesusr.com/ugd/42bae0_19ef412d215e491cb973ef98a4bebe6a.pdf?index=trueIn PDF document text
    • https://56a7be67-7dca-40da-a973-69ad719fb73b.filesusr.com/ugd/fedf23_fe754f9b9db34f348247669177838a0e.pdf?index=trueIn 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_off0000f38c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF38C 5136 bytes
SHA-256: d110ccfd372215b8655dda64070f317b43938ec7196204a2749e8ff8916a91f0
font_01_sfnt_off000104d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104D1 10740 bytes
SHA-256: c3de6f540a061e5dc762a2d25ed505e9dc9afec7711bb506066d31047568a582

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