Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1fa29b261cf8ecb…

MALICIOUS

PDF

76.2 KB Created: 2021-03-22 10:19:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 1409a589d990d87e2e525d65aac43d37 SHA-1: 03ca6f44c8a310faa8b622ad2817a74fe8456706 SHA-256: e1fa29b261cf8ecbd62e539d4228a696267154cc413b418ce415f5b87daa60fd
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple critical heuristics as a malicious redirector and a link farm. It contains numerous embedded URLs pointing to various domains, some of which are associated with known malicious infrastructure. The ML classifier also strongly indicated maliciousness, and ClamAV detected it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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.
  • 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://dafemum.ru/aws?utm_term=cursos+de+ingles+gratis+alcaldia+de+medellin In PDF document text
    • https://cdn.sqhk.co/boxokozofe/gdjjnje/heart_keychain_images_free_download.pdfIn PDF document text
    • http://cloudmarket.website/doxojua562p.pdfIn PDF document text
    • https://cdn.sqhk.co/sufokorume/gy6OKRo/super_mario_kart_tour_event_how_to_complete.pdfIn PDF document text
    • https://cdn.sqhk.co/wuvevalor/fBjh6ia/55162421442.pdfIn PDF document text
    • http://nunopasatipimav.medianewsonline.com/definicion_de_alumno_segun_autores.pdfIn PDF document text
    • http://gufutaca5.xyz/52_week_money_challenge_10000gv580.pdfIn PDF document text
    • https://cdn.sqhk.co/vixukose/jbXiiRh/download_grow_hero_mod_apk.pdfIn PDF document text
    • http://gidilakapajuke.mywebcommunity.org/10992080315.pdfIn PDF document text
    • https://cdn.sqhk.co/terasovo/Nnz8ie5/nuke_minigun_fallout_4_mod.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vunonam.atwebpages.com/pneumatic_drives_system_design_modelling_and_control.pdfIn PDF document text
    • https://30383b9b-b26a-44f4-9a26-03873af8f03c.filesusr.com/ugd/fdee49_51a9cfb47789498f857f79f09abd9b68.pdf?index=trueIn PDF document text
    • http://vigexosav.myartsonline.com/74185061153.pdfIn PDF document text
    • https://8d90b851-447f-4cfc-ac95-1e867b71b983.filesusr.com/ugd/b371d9_32fb950677c04129b664fa21918b5705.pdf?index=trueIn PDF document text
    • http://magegefopo.atwebpages.com/26422597153.pdfIn PDF document text
    • https://c0e8410b-c394-4b36-8083-179878a46647.filesusr.com/ugd/d4b1dc_a1caf67ca71044d6b9e9f25071ea10cf.pdf?index=trueIn PDF document text
    • https://56a79910-2d97-40e4-a1df-bca3b17021d7.filesusr.com/ugd/2721fc_5150fbf6662f4ac085e142f65af3482a.pdf?index=trueIn PDF document text
    • http://tepominofujemo.atwebpages.com/atlas_mnemosyne_aby_warburg.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e949.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE949 5164 bytes
SHA-256: 2166e41164fd382544b169dd0e9a59380889de8e3ebe712ac429523cf9bc27f8
font_01_sfnt_off0000fabf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFABF 12700 bytes
SHA-256: 32a5c1fd0b4eab60a6f9d875c6326df37a45afdc252ab4df4a8fad82e3de9c4b

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