Malicious PDF — malware analysis report

Static analysis result for SHA-256 df245263d8000697…

MALICIOUS

PDF

94.7 KB Created: 2021-03-23 13:05:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5dc4f71fec60f097ba3dd14a6d9bf2fc SHA-1: 19156e1f0683858f690418930d9eccfffd51213c SHA-256: df245263d80006978fdca446321118163572e0941a3802766cbbbd7e44e8b750
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with at least one pointing to a link farm hosted on disposable infrastructure, suggesting an attempt to obscure the final malicious destination. The document body, though heavily obfuscated, contains metadata indicating it was generated by wkhtmltopdf, a tool often used to create malicious PDFs.

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://pelibifir.ru/aws?utm_term=ejemplo+de+jerarquia+de+los+valores
    • http://jorowijedo.mywebcommunity.org/cbc_test_report_sample.pdf
    • https://fudewuwadume.weebly.com/uploads/1/3/0/7/130740250/8269f.pdf
    • https://cdn.sqhk.co/mefivujosawo/ehijb2R/world_market_promo_code_online.pdf
    • https://cdn.sqhk.co/fedovipawe/jfKosja/37709739342.pdf
    • https://guxipalun.weebly.com/uploads/1/3/1/8/131857363/kigezewugofowu-lemanotoza.pdf
    • https://cdn.sqhk.co/xaranoraf/iaM9jgq/bizide.pdf
    • https://cdn.sqhk.co/fetumamuv/PfKiggd/lidunerokavutumodofewatu.pdf
    • https://mevagosulen.weebly.com/uploads/1/3/5/3/135391340/a91ceaa91cf.pdf
    • http://lilubaxubaxulu.sportsontheweb.net/conic_sections_and_analytic_geometry_book.pdf
    • https://semebikifotiz.weebly.com/uploads/1/3/4/7/134752265/pebux.pdf
    • https://kofovozeregom.weebly.com/uploads/1/3/4/3/134313602/679edf.pdf
    • http://zovolexune.sportsontheweb.net/sense_and_sensibility_2008_episode_1_watch_online_free.pdf
    • http://nidewopovuwubo.mypressonline.com/how_to_get_evaluated_for_sleep_apnea.pdf
    • https://cdn.sqhk.co/mugodetutag/hfEghSM/57163190567.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://03dfb0eb-7fe6-4188-ad87-ea2b88df7b19.filesusr.com/ugd/f967ac_f53d307e14444d6997e7ddc1c9ef14af.pdf?index=true
    • https://5fdaa9e0-ad6d-443b-8779-beb8e45026dc.filesusr.com/ugd/05301a_c48d8dcbc03d445c94b3d02f8a7db028.pdf?index=true
    • https://uploads.strikinglycdn.com/files/c37a8622-4cc7-4937-8a7e-658ecfb30fa9/disavuj.pdf
    • https://s3.amazonaws.com/zurovajij/autoclave_procedure.pdf
    • https://uploads.strikinglycdn.com/files/94f4a967-5394-46c8-b16d-e7a440eeb6e2/60954983206.pdf
    • https://uploads.strikinglycdn.com/files/9ebecedd-eecf-415b-b5e0-b9d28034f3b1/sepanikopimogij.pdf
    • https://s3.amazonaws.com/jovekus/meade_ds-114_eyepiece.pdf
    • https://s3.amazonaws.com/zidosozawok/12264184227.pdf
    • http://jabejanaboz.atwebpages.com/sons_and_lovers_summary_litcharts.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012413.bin
6f6dbfe53600126fa942e3a030951f47bee44eb34d3f87faf8d813ae2e380066		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12413 5020 bytes
font_01_sfnt_off00013527.bin
1812b72ab8997abce832195af53e650167e991ca930099dfb4e687f7640e9f5d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13527 12912 bytes
font_02_sfnt_off00015d62.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15D62 4324 bytes

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