Malicious PDF — malware analysis report

Static analysis result for SHA-256 0462073a7157e845…

MALICIOUS

PDF

77.9 KB Created: 2021-03-14 12:20:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1ec6791a54f5b119dac34441ea474178 SHA-1: 924a086d390c4c9945214e9e553d0589b1aad889 SHA-256: 0462073a7157e845855557c029844edcddcc87b779ac86d33850e54d068ce120
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. It contains a large number of external links, suggesting a link farm or a distribution point for malicious content. The embedded URLs point to various PDF files, some of which are likely intended to trick users into downloading applications or other malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://nipisod.ru/123?utm_term=bully+apk+android+1
    • https://cdn.sqhk.co/kufagilan/oeFid2m/openttd_download_location.pdf
    • https://cdn.sqhk.co/kapumikogux/eRohhjd/bluestacks_4_apk_ykleme_hatas.pdf
    • https://cdn.sqhk.co/vateviti/AcCibgf/dafugasekulomukowuf.pdf
    • https://cdn.sqhk.co/pifajaloro/d5lGTia/ice_cream_color_by_number-_coloring_pixel_art.pdf
    • https://static.s123-cdn-static.com/uploads/4472186/normal_5fdf1e20ea329.pdf
    • https://cdn.sqhk.co/kifuzopeko/dhchiGx/my_football_club_manager_apk_mod.pdf
    • https://cdn.sqhk.co/gobajejuz/gBjhgh0/bikatepolifetowijagire.pdf
    • https://static.s123-cdn-static.com/uploads/4462732/normal_5fe424b973972.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/guwutivupudutu/41833454263.pdf
    • https://9fbaa0db-fe9e-443e-b503-3d02ea494c21.filesusr.com/ugd/d417e9_70acc2dfd12d4a8b82d69c2508d49151.pdf?index=true
    • https://abbf68a8-5b21-4996-91be-11266bd273ed.filesusr.com/ugd/9374a7_96e8323100da463cbe0fb49485a717bf.pdf?index=true
    • https://s3.amazonaws.com/wetowuzuxit/furikipiv.pdf
    • https://uploads.strikinglycdn.com/files/8c160624-cc8a-45bc-b107-ab2a2ff401dd/vutawowesadutuwewem.pdf
    • https://uploads.strikinglycdn.com/files/fa73fa50-95a2-4395-a864-02f1d43053ac/xamuvovuzonujanonuwekev.pdf
    • https://uploads.strikinglycdn.com/files/f8a40263-6ff9-4719-9bed-25644be66cf2/bixetefuxovanuresimab.pdf
    • https://s3.amazonaws.com/fedure/what_does_intercession_mean_in_the_bible.pdf
    • https://uploads.strikinglycdn.com/files/48c8c39c-92d4-44d0-a229-d4f6b7a04f77/rodexova.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_off0000db12.bin
85b5aa98de69549cc596316319a3729bba5b9934458aef29d91ec5268798e3bb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDB12 4724 bytes
font_01_sfnt_off0000eb22.bin
64c807c10333a6c7f3d073d92636a5dae06fbc628c3bc50143ce1afb68df7482		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB22 22088 bytes
font_02_sfnt_off00011cb4.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11CB4 4324 bytes

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