Malicious PDF — malware analysis report

Static analysis result for SHA-256 355982dcd10f4b3d…

MALICIOUS

PDF

84.6 KB Created: 2021-04-20 04:15:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2ccb4783157d765b282eee2d85ff3d1d SHA-1: 9148fbcc2127951ac50206804424dbb9a2cc9e69 SHA-256: 355982dcd10f4b3dfb270922db461693a6b3cb7841bdfb144d006e78e7e54c8c
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a significant number pointing to link farms and potentially malicious domains, as indicated by the PDF_SEO_LINK_FARM and PDF_URI heuristics. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution, disguised as a movie download lure. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://zajinet.ru/strik?utm_term=the+four+movie+download+in+hindi+dubbed+480p
    • https://suvosimi.weebly.com/uploads/1/3/4/6/134688706/8ff76b4c3da0e9a.pdf
    • http://requiremcgood.com/burial_at_sea_episode_2_door_codesbyko1.pdf
    • http://sijubuwejipamun.mywebcommunity.org/jeronodifokomor.pdf
    • https://nixejovebomir.weebly.com/uploads/1/3/1/3/131380485/zidivepomalapumaf.pdf
    • https://rajilogibakew.weebly.com/uploads/1/3/5/3/135326989/326596.pdf
    • http://storeplus.pro/puneberifucpfco.pdf
    • http://lezigovedavide.getenjoyment.net/contract_costing_formula.pdf
    • http://komarovskii.xyz/613066616209t8qt.pdf
    • https://solugukaxazazo.weebly.com/uploads/1/3/4/7/134748989/6401216.pdf
    • http://losopefopamusoz.sportsontheweb.net/mediheal_ac_dressing_ampoule_mask_review.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/38da0f98-5adc-4693-b8a7-372ad444d05e/35241468613.pdf
    • https://uploads.strikinglycdn.com/files/b96a9ea0-5c8d-45da-bad9-f9205dc1f47c/jeep_wrangler_interior_accessories.pdf
    • http://kewetanetoza.atwebpages.com/42839524379.pdf
    • https://uploads.strikinglycdn.com/files/61359bcc-7205-4903-a132-f7676356d9a3/41271231871.pdf
    • https://uploads.strikinglycdn.com/files/594e28ea-ff38-4904-ae68-381fb918aa77/lukel.pdf
    • https://uploads.strikinglycdn.com/files/7477fd94-48a7-4cdf-930a-b198fb086252/21117839801.pdf
    • https://uploads.strikinglycdn.com/files/fe82412c-fff8-459e-99c4-ee73728ed5e8/5377373049.pdf
    • https://178fd8f3-986e-459b-a431-83c1f58eadb8.filesusr.com/ugd/7a8e82_2355b78e60794640956debe68c621734.pdf?index=true
    • https://uploads.strikinglycdn.com/files/2a656b8d-10a8-4bf1-957b-38750d633241/frigidaire_fghb2866pf_owners_manual.pdf
    • https://uploads.strikinglycdn.com/files/dee748c3-715a-410c-be5e-b2a99352ad4f/kenmore_elite_he5_dryer_owners_manual.pdf
    • https://b5d51143-f34a-4a4f-9265-6917490cb775.filesusr.com/ugd/9f69bd_8f7b7981d6d5482cafdd41f0a336e34f.pdf?index=true
    • https://34e223d5-b18a-4f89-96b3-7c58aa965d90.filesusr.com/ugd/440e29_760bdd332b83454b902f5466bb638b87.pdf?index=true
    • https://4a31e3f8-49e3-4331-b1a9-c0bb7a6b9dbc.filesusr.com/ugd/599f1c_83bdf5985733403c8ab2b9d2fe828044.pdf?index=true
    • https://uploads.strikinglycdn.com/files/1a949f48-9e51-4197-8230-a59a94641cdb/wixin.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_off00010c06.bin
a52ab4775540dec6529252b975f8ec2286a7355b3a589f5024126f01a898951e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10C06 5768 bytes
font_01_sfnt_off00011f91.bin
c7af0d1dde53dfaec6b75c2b209eec23006b9131046b0b0c1c1454196d8f829e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11F91 10828 bytes

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