Malicious PDF — malware analysis report

Static analysis result for SHA-256 d190ca24ec95690d…

MALICIOUS

PDF

42.2 KB Created: 2020-11-06 08:47:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 20ddcc12ca2865499c6bf1594cf74829 SHA-1: 172bac7b1b70b49c421796379045d3b193642448 SHA-256: d190ca24ec95690da2c2144d1716919f2a1273f5abfa8d854e5c5d4f483afff1
126 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified as a link farm. The ML classifier strongly indicates maliciousness, and the presence of numerous links to various hosting platforms suggests an attempt to manipulate search engine results or distribute further malicious content. The primary URL observed in the document body is https://trafftec.ru/123?keyword=wm+rogers+nickel+silver+flatware.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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.
  • 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://trafftec.ru/123?keyword=wm+rogers+nickel+silver+flatware PDF link annotation
    • https://mumixopid.weebly.com/uploads/1/3/1/8/131872042/c68478389b.pdfIn PDF document text
    • https://jemiwuwavaza.weebly.com/uploads/1/3/0/8/130814288/tigosorivibisakoxu.pdfIn PDF document text
    • https://wotafoxig.weebly.com/uploads/1/3/4/3/134306194/xikafonogari.pdfIn PDF document text
    • https://lavigumujow.weebly.com/uploads/1/3/4/4/134438710/c8b08e04.pdfIn PDF document text
    • https://pigofularujatuf.weebly.com/uploads/1/3/4/3/134360020/bosorijawe.pdfIn PDF document text
    • https://teguvubab.weebly.com/uploads/1/3/4/3/134347924/9056753.pdfIn PDF document text
    • https://kubupukadumu.weebly.com/uploads/1/3/1/3/131382740/6db130e93e1.pdfIn PDF document text
    • https://xuxefakeni.weebly.com/uploads/1/3/4/2/134234722/lekaf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/sesafefanulokam/strawberry_dna_extraction_lab_report_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/ditiruz/convert_scanned_to_word_editable_free_download.pdfIn PDF document text
    • https://s3.amazonaws.com/widuxade/premier_student_loan_center_irvine.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/19b86f3b-4267-4b98-ac29-ff6668d62906/fibepawefosidudog.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/012c407a-74bb-4ffd-af02-f2944c764ca8/9409214954.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/06436881-b802-40e5-b6ac-8c263f9d90c5/fitepijopuv.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_off000063dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x63DD 5428 bytes
SHA-256: 55480cb978d881f29fb60513ac8bff5ce6c61ae944561404cdf1d72683247ea9
font_01_sfnt_off0000766a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x766A 11268 bytes
SHA-256: b683f50ecd86bf89c003637f39b46f33f6db7bf7c40699b2975a88b1a7ea449f

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