Malicious PDF — malware analysis report

Static analysis result for SHA-256 73ece7898a790f0b…

MALICIOUS

PDF

85.6 KB Created: 2021-04-06 19:57:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5d38a7ce3439c4c5b3a93b1d6266b922 SHA-1: 9f9348683eaf1c25b9c534fa70c8e163e2e4c048 SHA-256: 73ece7898a790f0bad987f191f78d4aceff489a9ef437cbb84f8b53bad7c159b
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to potentially malicious domains, suggesting a link farm or phishing attempt. The ClamAV detection and ML classifier strongly indicate maliciousness. The embedded URLs are likely used to redirect the user to a malicious site, potentially for credential harvesting or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://zajinet.ru/strik?utm_term=warm+white+christmas+lights+outdoor+battery
    • http://gixokil.iblogger.org/65432708973.pdf
    • https://bujibapi.weebly.com/uploads/1/3/4/3/134383234/pozonaxajevisivuv.pdf
    • http://subexadedesu.iblogger.org/dezaxilapusajok.pdf
    • https://cdn-cms.f-static.net/uploads/4476123/normal_60112b9e97096.pdf
    • https://timodidub.weebly.com/uploads/1/3/1/3/131379596/gekipivup-kamubibugi-rajupepeg.pdf
    • https://vamubediva.weebly.com/uploads/1/3/4/9/134901044/dipixejub.pdf
    • https://kisejugizojo.weebly.com/uploads/1/3/4/6/134656745/sifalojuxeso_dexuki_bagupegaduvuz.pdf
    • https://cdn-cms.f-static.net/uploads/4418579/normal_606720819e859.pdf
    • https://cdn-cms.f-static.net/uploads/4375095/normal_6013a387e4c39.pdf
    • http://monanuzusud.22web.org/50580423859.pdf
    • https://static.s123-cdn-static.com/uploads/4483359/normal_6006caea45c23.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/setigafat/13936523310.pdf
    • https://uploads.strikinglycdn.com/files/9adebcf3-ddff-40cd-9adf-5f9adf112d56/tenarironozugaz.pdf
    • https://uploads.strikinglycdn.com/files/ab4da1b2-c775-4aa0-9ddf-add27e91158b/rebel_300_weight_limit.pdf
    • https://s3.amazonaws.com/divexikav/salesforce_lightning_platform_plus.pdf
    • https://s3.amazonaws.com/dipafuxe/pes_2020_skills_explained.pdf
    • https://s3.amazonaws.com/novipaliwid/which_is_positive_and_negative_on_jumper_cables.pdf
    • http://najorenowodume.epizy.com/attagasam_full_movie_hd_free.pdf
    • https://s3.amazonaws.com/mefadedosuw/pompeii_bastille_piano_sheet_music.pdf
    • https://s3.amazonaws.com/jarawaxanivu/39639483044.pdf
    • https://s3.amazonaws.com/kewakuko/iobit_driver_booster_3_free.pdf
    • https://s3.amazonaws.com/tomaxade/google_spreadsheet_for_windows_10.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_off000112a5.bin
5ac97f1d72f1d330fc88b25f23b6144cf49f1a6704d627617f291ccd3f5ec9d4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x112A5 5700 bytes
font_01_sfnt_off000125f8.bin
820e3101571c61f3469c66472408d22af09642c1c53d37f809d685f6f4b44095		 pdf-font-stream PDF embedded font (sfnt) at offset 0x125F8 10212 bytes

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