Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b8736e222c7316c…

MALICIOUS

PDF

79.5 KB Created: 2021-03-19 16:12:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 41b4275c4ef14368013b5d004fe06cc3 SHA-1: deaaf1fcb5c0a6bbf6be0ecb205cfaadc14ab53f SHA-256: 3b8736e222c7316c6259f0564b33e976993e9361f27d5d884ed5dee52ca7a7a6
156 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or distribution mechanism. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the presence of numerous external URLs points to an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/award?keyword=casting+process+pdf+file
    • http://jawunefuda.mygamesonline.org/pathology_mcq_free_download.pdf
    • http://lg-copyright.com/657985040184fvla.pdf
    • http://bobr.space/pemokigoleragigelitami20pz.pdf
    • http://bitsracing.net/61253063445fust3.pdf
    • http://bcpreactiva-enlinea.com/vupedagosamitozelojatiphlvc0.pdf
    • https://bipasomuted.weebly.com/uploads/1/3/6/0/136010989/bf5d6208d84e.pdf
    • https://wepopoxewu.weebly.com/uploads/1/3/1/1/131164118/dofaxizisuwulibe.pdf
    • http://stopnutristrike.ru/17989831503j1q4g.pdf
    • http://im-marceting.site/the_cask_of_amontillado_vocabulary4xvm2.pdf
    • http://rotawafuwuno.scienceontheweb.net/introduction_to_finite_element_analysis_using_solidworks_simulation_2020.pdf
    • https://wikoxunorature.weebly.com/uploads/1/3/5/9/135968981/sojapav.pdf
    • http://lavka-karamel.ru/how_to_use_ergo_360_with_infant_insertxhpst.pdf
    • http://okclub.org/61951452913rllq3.pdf
    • http://xtw2.club/how_to_make_a_simple_paper_plane46q48.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://vafitinupisojud.onlinewebshop.net/arapa_trke_szlk_kitap.pdf
    • https://uploads.strikinglycdn.com/files/eadf7760-18fe-4d76-b6d9-d5b124a5330d/tejis.pdf
    • https://uploads.strikinglycdn.com/files/ba88a79f-0ee6-418c-ab5f-cb24700f83c0/how_to_know_which_element_has_the_largest_atomic_radius.pdf
    • https://uploads.strikinglycdn.com/files/2b9895a1-97ee-4f2e-9e83-2acc6d209236/do_psychologists_have_mental_problems.pdf
    • http://sopexalibip.onlinewebshop.net/wosebevin.pdf
    • https://uploads.strikinglycdn.com/files/1ee6e911-de05-4fb5-8615-4ebf4d909eee/microsoft_excel_shortcut_keys_free_download.pdf
    • https://uploads.strikinglycdn.com/files/98bfa236-130b-40cf-91f2-347e291b7c3d/how_to_fix_web_services_on_hp_printer.pdf
    • https://uploads.strikinglycdn.com/files/5320f945-90f5-4afb-b993-6d2d4f2d345c/bovekabo.pdf
    • http://dowafirowelumex.atwebpages.com/40821930315.pdf
    • https://uploads.strikinglycdn.com/files/728f6b63-c4b4-433e-b321-b33ffa053651/65968212510.pdf
    • https://uploads.strikinglycdn.com/files/54da6631-b261-415d-98bb-78c6bf79f6c6/94386692392.pdf
    • https://uploads.strikinglycdn.com/files/23b9f6c0-635e-4544-8e6d-2dc818fd7ac4/31803491746.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fb86.bin
cd17328db0bdc13bb011267186a9b1fb4a7f220e27b639c7cb820f92249486b8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB86 5228 bytes
font_01_sfnt_off00010d5d.bin
f431c747f476f4b91b803422e28ba7d4f9bf91751248da6da0c9975f2bf1a688		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10D5D 10292 bytes

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