Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0825efcbda38274…

MALICIOUS

PDF

66.7 KB Created: 2020-12-08 17:45:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 0d99b871b9909780c98883fc8b402fbb SHA-1: 1ba4abba43f7faa99d8810c626fa72802bd27bf5 SHA-256: b0825efcbda38274dade3c16d1fd194711cade31f63f6a909d629bc3323fcb79
186 Risk Score

Malware Insights

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

The PDF file was identified as malicious by a ClamAV signature and an ML classifier, indicating a high likelihood of malicious intent. It contains a significant number of external links, with many hosted on disposable domains, suggesting a link farm or phishing operation. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic further support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://trafffe.ru/strik?utm_term=qod+abbreviation+medical+term PDF link annotation
    • https://xixunogada.weebly.com/uploads/1/3/4/3/134343035/pedaxotos_vazawogizuwaju_moxajujex.pdfIn PDF document text
    • https://ribuborufexegax.weebly.com/uploads/1/3/4/5/134507127/niwomivegivuk-zezisilubopobab.pdfIn PDF document text
    • https://vukaxibunima.weebly.com/uploads/1/3/4/8/134885707/fujazijafile-vilimap-logujatoragu.pdfIn PDF document text
    • https://luzatewuxajexi.weebly.com/uploads/1/3/4/2/134265782/356dd42093cb37.pdfIn PDF document text
    • https://lusefova.weebly.com/uploads/1/3/4/5/134583673/xefitudakifiro-lodidixusexi-pisawixopam-wonipusazoba.pdfIn PDF document text
    • https://xuvuvigaxopezut.weebly.com/uploads/1/3/4/7/134721928/f65f298.pdfIn PDF document text
    • https://pizipeko.weebly.com/uploads/1/3/4/6/134611096/9029709.pdfIn PDF document text
    • https://ximazula.weebly.com/uploads/1/3/0/7/130738777/dufola_kefarivuguf_tufop.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/89f6f4f0-36d4-4eab-97a9-d9e05eebbfb4/la_llave_de_salomon_espaol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/68277ab8-b0c6-4b2f-8a49-1be8c14ab749/linux_for_dummies.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/29b7475b-45c9-4d3c-ae5b-d2f253a6a7d3/hydraulic_shop_stool_with_backrest.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cb2d1fc1-bd24-4221-b395-ef2fd081a452/kipod.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2d5b1321-9020-40b3-b9b8-7e0d62a8f1c2/rutevumixujalupuxifedeva.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/622025d4-58a5-4afa-8870-0943dd7e5802/boston_public_school_calendar_2018.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c85a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC85A 5168 bytes
SHA-256: 91c67790f18346fd2a7112589491f7a97189a5c0d90b2820a6796b6e75f79482
font_01_sfnt_off0000d9db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9DB 10704 bytes
SHA-256: f2fddf411b6b3ac3cde8c05241731286a4db6d940eed2fff9252ce6d4bca7fc6

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