Malicious PDF — malware analysis report

Static analysis result for SHA-256 da37bf2ed7090830…

MALICIOUS

PDF

79.0 KB Created: 2021-03-23 15:12:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5383b816d418d6950487bb650cada9a3 SHA-1: bd8792dfde1af595338374c68ad1aef35fc56fd0 SHA-256: da37bf2ed709083069b2a2ee50ec18c3d235ec00b130e081d5b7ef78566cda91
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are hosted on dynamic DNS services or file-sharing platforms, indicating a link farm or distribution point for malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the PDF structure and numerous external links point towards a social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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=free+company+credit+report+australia
    • https://tejukikefuxod.weebly.com/uploads/1/3/4/7/134703803/vibekoxupoz.pdf
    • https://static.s123-cdn-static.com/uploads/4366400/normal_5ff69f712a719.pdf
    • https://tewamuwomipatus.weebly.com/uploads/1/3/0/9/130969874/kigikakanadan.pdf
    • https://kafunonedejo.weebly.com/uploads/1/3/4/6/134662894/02d01bbed0182.pdf
    • https://nefolebar.weebly.com/uploads/1/3/4/4/134400051/demudaravu_bidifukowifev_busafuv.pdf
    • http://tisekadulokin.iblogger.org/accounting_and_finance_for_non_specialists_peter_atrill.pdf
    • https://famonusowofem.weebly.com/uploads/1/3/4/3/134349488/bofejuv.pdf
    • https://cdn-cms.f-static.net/uploads/4412378/normal_604cff848873c.pdf
    • https://zulasiromeg.weebly.com/uploads/1/3/1/4/131453934/kokemilobex.pdf
    • https://sozatugija.weebly.com/uploads/1/3/4/8/134859818/kowon-sesifojomukupu.pdf
    • https://newafiramolik.weebly.com/uploads/1/3/1/0/131070062/5552323.pdf
    • https://metojonokodoto.weebly.com/uploads/1/3/4/8/134881876/divefirupolexo.pdf
    • https://cdn-cms.f-static.net/uploads/4462681/normal_603ce24c7f82d.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/865b5001-3ab5-4809-8b89-d02df9cc987b/77006601454.pdf
    • http://verekoxamokit.epizy.com/best_workout_dvd_for_seniors.pdf
    • https://uploads.strikinglycdn.com/files/4af84cc6-d1cc-40b6-97c9-836febfec381/how_to_do_a_force_reset_on_iphone.pdf
    • https://uploads.strikinglycdn.com/files/fafe05e3-794a-40b4-a62c-86d3fb953718/lemujabavamesamovokizova.pdf
    • http://ralenosozizog.epizy.com/glossary_of_anthropology_terms.pdf
    • https://uploads.strikinglycdn.com/files/ae353052-8e70-4d7e-b85c-c40bbd3ee4a9/popumadutinidi.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e8ac.bin
3ab27c2c504632fba550f897c1eb1c2959ec701de8afc4ab9ae01545ff93f49f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE8AC 5160 bytes
font_01_sfnt_off0000fa18.bin
5da3de0972784e199f76ebf2a1c50e1f7d7990617bec9506223a1a7f3a83df14		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA18 10820 bytes
font_02_sfnt_off00011edf.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11EDF 4324 bytes

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