Malicious PDF — malware analysis report

Static analysis result for SHA-256 4aba385fadeb7fb0…

MALICIOUS

PDF

77.1 KB Created: 2021-04-26 20:57:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c847185b07cb3867784c3df8ad3f96ff SHA-1: 9c93f5eb00e9b3a24a9f22942f54830c83f4163a SHA-256: 4aba385fadeb7fb0177a6ecd8a6f4712d4319c6088ffcd15a3d7cb118407cc55
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which point to suspicious domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a phishing lure designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://nipisod.ru/strik?utm_term=health+and+safety+policy+template+alberta
    • http://lijonotogi.scienceontheweb.net/70561953656.pdf
    • https://xibuzapesajeg.weebly.com/uploads/1/3/4/2/134236274/ca06a08a120b5.pdf
    • https://xutafutixon.weebly.com/uploads/1/3/4/5/134576274/7728419.pdf
    • http://ins.expert/big_little_lies_season_3_reviewwg0gd.pdf
    • https://bexavulurezil.weebly.com/uploads/1/3/0/7/130738929/rinalodesalidemepiz.pdf
    • http://health-top.ru/what_is_the_si_unit_of_refractive_indexugdpa.pdf
    • http://bulubuzigajuzar.getenjoyment.net/pegatron_m2n68-la_cpu_support.pdf
    • http://magnitoli-2ekran.site/does_cbt_work_for_anxiety_reddithzj29.pdf
    • http://filemarker.store/de_taali_bal_ganesh_video_songm64r1.pdf
    • http://rent-nout.site/aws_cloudformation_subnet_availability_zone58kpq.pdf
    • http://perevozka.ru/28622354461pmxw7.pdf
    • http://moitender.org/wawuvib8tfyj.pdf
    • http://raicen.com/happy_birthday_fonts_calligraphy_freeixafr.pdf
    • http://semengergel.ru/wefodaviluwukovqa2xz.pdf
    • http://bukuminuwakub.mypressonline.com/30891276685.pdf
    • http://lapitubemexidi.mywebcommunity.org/16411389486.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/f374d84a-b90a-47ef-9222-4996b3d0848a/petsafe_in_ground_fence_setup.pdf
    • https://uploads.strikinglycdn.com/files/85815e62-b85b-4231-a997-0d0391d8d108/visomira.pdf
    • https://uploads.strikinglycdn.com/files/4c2e3de3-5371-480b-8813-f78f1ee1ebbd/308995288.pdf
    • https://uploads.strikinglycdn.com/files/e52379e4-7662-48e0-8081-342e07146712/jeux_de_carte_personnalis_recto_verso.pdf
    • https://uploads.strikinglycdn.com/files/9beb8864-1691-4cc0-96e4-ed4eea09bf11/pimeditolisudimuvudaro.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_off0000ef84.bin
98f7fcedd7abc6ec73301fa78fda8c6821c57211779e8a56021473f735dd64d7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF84 5600 bytes
font_01_sfnt_off00010265.bin
0a762db356129cb3e948cc524b5f8b7d2a66af76c8feca3a17efe75f1f0b0ce1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10265 10640 bytes

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