Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5d9916788dc8146…

MALICIOUS

PDF

83.9 KB Created: 2021-03-25 12:46:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4845a10d3c2ee3bda9de3625e219fd8e SHA-1: 1894dff6b5e88410f0f4046cdc9624a0a2971322 SHA-256: c5d9916788dc814693e1900d490346dc4418b0cbbc0384ddb3bffa6840dbe209
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating it likely exploits vulnerabilities or contains malicious content. The heuristic 'PDF_SEO_LINK_FARM' indicates the document contains a large number of external links, with the primary one being http://prizinsta24.site/zagikosubijatewgdz2w.pdf, suggesting an attempt to redirect users to malicious sites for further exploitation or phishing. The presence of embedded URLs and the nature of the link farm heuristic strongly suggest an attack pattern focused on driving traffic to compromised or malicious web resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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/123?utm_term=las+reformas+borbonicas+que+son
    • http://prizinsta24.site/zagikosubijatewgdz2w.pdf
    • https://koxabiwepa.weebly.com/uploads/1/3/4/3/134309970/wolubifo_debumukos.pdf
    • https://cdn.sqhk.co/niwuwusogoxo/KhiznoF/zidomorinejipuv.pdf
    • http://hookup157.site/2_player_cupheadzstp2.pdf
    • http://cmbclientes.com/effortless_mastery_liberating_the_musician_withinqufrx.pdf
    • http://info-pages.ru/whirlpool_washing_machine_accessories_near_mect1cf.pdf
    • https://zixaxufomomofir.weebly.com/uploads/1/3/0/7/130738537/rigeborojuwubogu.pdf
    • http://arevakar-travel.com/2855180613c752d.pdf
    • https://zuwiliwiwira.weebly.com/uploads/1/3/1/0/131071082/musoxekus_kodesidivere_tapepizezir_sefuziji.pdf
    • http://cleaner360.shop/pirufiparanagenasulio48g2.pdf
    • https://nevutero.weebly.com/uploads/1/3/4/7/134716167/dupazu.pdf
    • https://jitedamanun.weebly.com/uploads/1/3/4/6/134627504/c8f7caea6aa91a.pdf
    • https://mevamakokuvafas.weebly.com/uploads/1/3/4/0/134040887/pamubonaviw.pdf
    • http://nuverlites.online/43764136218giwb.pdf
    • http://mini-cam-v2.club/bhavani_mala_telugu_songs_freen13sm.pdf
    • https://gotedimonov.weebly.com/uploads/1/3/4/7/134761190/vefarimalatarakorotu.pdf
    • http://meriline.store/chess_rush_positioning_guide70h1l.pdf
    • https://cdn.sqhk.co/vuvupewog/gehG73x/24872447173.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://6478d21b-237c-41b5-add8-96d7b9819624.filesusr.com/ugd/c7ef1a_c8218c24d8414863a40cc90a6a67a8ab.pdf?index=true
    • https://40e214c1-1950-44e8-a195-e2c6eeb23253.filesusr.com/ugd/a517f4_afb82c72441e46afa58298691e5a66dc.pdf?index=true
    • https://2987c0f4-171e-4473-b3f1-a5468658115b.filesusr.com/ugd/75ff8a_28faf05ecfb348288edc707745bc4a29.pdf?index=true
    • https://43fe4710-460a-4ad3-90dc-2dd795c51528.filesusr.com/ugd/a32c20_d039096971194cf1afc71ef2779d8b9e.pdf?index=true
    • https://f499a9ea-5579-4d3c-a180-ba191067f9b7.filesusr.com/ugd/34ec99_d055c8de50524d6dae88ae98ac3fe6cc.pdf?index=true
    • 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_off0001095c.bin
df90d4ca14cd2ca6b0c9fb9d2ecdd96388c2b19b94e9bac687959c92193626b1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1095C 5204 bytes
font_01_sfnt_off00011afc.bin
c3d9b993d0721d21621a90bfbd9156481e05789f9a92869305a26314cadd15f5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11AFC 11756 bytes

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