Malicious PDF — malware analysis report

Static analysis result for SHA-256 1443eaf117dbc414…

MALICIOUS

PDF

74.9 KB Created: 2021-03-29 05:18:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 058e2e2b63bdef1c477416bd5f34d5d1 SHA-1: cea1cbc146b7df7fd10b5ece395ddfaa34db4be3 SHA-256: 1443eaf117dbc414d38d52e0050d9c1ec74dfb0c77df61ed554eb510809cbf2c
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, a common tactic for link farms and phishing campaigns. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as Pdf.Phishing.Trojan. The presence of numerous external URIs suggests the document is designed to redirect users to potentially malicious sites for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/strik?utm_term=arris+surfboard+sb6141+keeps+rebooting
    • https://cdn-cms.f-static.net/uploads/4405208/normal_5fd2c54e3e93d.pdf
    • http://prizinsta24.site/audi_s5_wikijmp80.pdf
    • http://hairsprof.ru/36440721181ud25m.pdf
    • http://about-central.com/75313527200lulb7.pdf
    • http://cosmicgig.com/242527104582gb5a.pdf
    • http://songkfrk.site/galvanized_iron_sheetjr5ku.pdf
    • https://cdn-cms.f-static.net/uploads/4381344/normal_604e0cb584cf9.pdf
    • https://titobabedax.weebly.com/uploads/1/3/4/3/134317276/8fc147e43d.pdf
    • http://tovelksa.website/amoeba_sisters_video_recap_mitosis_answerswcp3p.pdf
    • https://taruzalo.weebly.com/uploads/1/3/5/3/135398133/37b137bd6.pdf
    • https://revawowi.weebly.com/uploads/1/3/5/3/135317167/a6010b35.pdf
    • http://frukt.space/elm327_mini_bluetooth_pc_softwarebvzug.pdf
    • http://buybritishcat.com/tekudedirisukopijixemovowz0h3.pdf
    • http://matteset-spon.space/how_much_does_a_vendors_license_cost_in_ohiokp7cx.pdf
    • http://operationhomeplate.com/a_little_jazz_masspk4o5.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/52557ffe-30d4-4d36-a4a4-88d28e3e9bb3/basivugulewizu.pdf
    • https://uploads.strikinglycdn.com/files/fc253c9a-fc74-4258-b2a9-8505d56bc5c8/54588776352.pdf
    • https://uploads.strikinglycdn.com/files/53c8abc0-2092-41db-8a91-64393497c1c2/sofomebolisupalazijufat.pdf
    • https://uploads.strikinglycdn.com/files/9947a863-a2e2-498d-918d-1d8b7689cd10/what_does_mental_stamina_mean.pdf
    • https://uploads.strikinglycdn.com/files/881dc907-5898-40c1-ba7b-e07bb80eb66f/regevamekumukiwifa.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_off0000e59b.bin
5fe65859a41fac53d670e7d2e05cbb221774f07372b279afdf9cdf56b3d9504d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE59B 5664 bytes
font_01_sfnt_off0000f900.bin
b64406ceb39a48469d7b18f736a9d6b8b9e4a121d467922440a698a92bc128e0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF900 10960 bytes

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