Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbe48ac33570f531…

MALICIOUS

PDF

82.7 KB Created: 2021-05-23 02:56:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2101a21a798be5f61f4c0a376443d100 SHA-1: 562e1282a0e13bee44d19bc879e253012e355e01 SHA-256: fbe48ac33570f531066ac86dee992518468950e8e8fa2510abfd221bba42d144
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains, indicating a link farm or SEO manipulation tactic. ClamAV and ML classifiers identified the PDF as malicious, specifically as a phishing trojan. The presence of embedded URLs and the nature of the link farm suggest an attempt to direct users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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
  • 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://kuzutuzo.ru/strik?utm_term=nourrir+les+hommes+en+inde+dossier+cap
    • https://cdn-cms.f-static.net/uploads/4487399/normal_601607c624968.pdf
    • https://zisovubuzuteb.weebly.com/uploads/1/3/6/0/136086112/6245969.pdf
    • https://lapawiniposa.weebly.com/uploads/1/3/5/3/135323982/zarid.pdf
    • https://vororesefuvemux.weebly.com/uploads/1/3/0/8/130813496/nomikunuguzezug.pdf
    • https://fokuxadeji.weebly.com/uploads/1/3/4/5/134585395/tebusise.pdf
    • https://sitapiwagese.weebly.com/uploads/1/3/0/8/130814355/d60457d702a.pdf
    • https://cdn-cms.f-static.net/uploads/4370542/normal_6013136e48c7b.pdf
    • https://cdn-cms.f-static.net/uploads/4444104/normal_602e645512f2f.pdf
    • https://piberarejini.weebly.com/uploads/1/3/5/3/135332679/7a35d7cd0cc0f6c.pdf
    • https://cdn-cms.f-static.net/uploads/4503533/normal_5fe98dda13bf8.pdf
    • https://jozegolufipiz.weebly.com/uploads/1/3/0/7/130776065/0b879c026de641e.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/cd4c37e6-b392-4e5f-806f-328bd6323663/multiton_tm_55_pallet_jack_parts.pdf
    • https://uploads.strikinglycdn.com/files/197599f7-7c86-4c50-97a9-ace623bdeceb/navamatafenisoxuk.pdf
    • https://s3.amazonaws.com/wajufifenoxuj/teresigegokekajo.pdf
    • https://s3.amazonaws.com/latufenaw/thyroid_powerpoint_template_free.pdf
    • https://s3.amazonaws.com/jupudizadid/bissell_3624_spotclean_professional_portable_carpet_cleaner_reviews.pdf
    • https://s3.amazonaws.com/mexavofezoxi/onkyo_repair_near_me.pdf
    • https://uploads.strikinglycdn.com/files/17a3f10e-baf7-4db4-a76a-43bceee885d2/congruent_shapes_worksheet_tes.pdf
    • https://uploads.strikinglycdn.com/files/15ca039e-3a61-44b2-99ca-54fbaf32aab6/how_to_light_pilot_on_richmond_water_heater.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed53.bin
7957454279178b61ee821f3cb8b0e6d42c358222f1b6b08e935d060df1ee03a7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED53 5280 bytes
font_01_sfnt_off0000ff1e.bin
98d9453c44260339d69933209948a717ea6a9725cd9c3c43c80e9bcda9353d5c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF1E 12476 bytes
font_02_sfnt_off00012697.bin
712590c835452c60cf4005d5ff3b4291b7bdb94b5c22500be4ce3d5353b46ed1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12697 16104 bytes

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