Malicious PDF — malware analysis report

Static analysis result for SHA-256 f162f1793d69b953…

MALICIOUS

PDF

38.6 KB Created: 2020-11-09 14:57:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: a6162c663a53409b8fd92558152753dd SHA-1: 91f306e804ebc226858f264c52b78c70953b9114 SHA-256: f162f1793d69b9534b731b36f9b4983949a6d1655278da03e31b6131b5eff521
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://traffset.ru/123?keyword=snell+s+law+worksheet PDF link annotation
    • https://nubagusajol.weebly.com/uploads/1/3/4/2/134235051/5995762.pdfIn PDF document text
    • https://pumowurunumig.weebly.com/uploads/1/3/2/7/132740285/5064079.pdfIn PDF document text
    • https://rigitugatelimo.weebly.com/uploads/1/3/4/1/134131632/sadilapadelavoz_jusosagaduj.pdfIn PDF document text
    • https://wivupenoremew.weebly.com/uploads/1/3/0/7/130775018/481069.pdfIn PDF document text
    • https://bukojawuwo.weebly.com/uploads/1/3/4/5/134508808/rajuvoxobexoveri.pdfIn PDF document text
    • https://zukamukenipebo.weebly.com/uploads/1/3/1/3/131380388/5750563.pdfIn PDF document text
    • https://wexofele.weebly.com/uploads/1/3/4/6/134632346/3446326.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/e7ddce37-6d64-4619-aa31-d9aa59aa769f/91454222237.pdfIn PDF document text
    • https://s3.amazonaws.com/voxulija/piwiwabisevupirebak.pdfIn PDF document text
    • https://s3.amazonaws.com/luropi/wavelet_matlab_code.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a70685c4-a0f7-49aa-aa75-3ce9e3a42e83/vuwawu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/301eea14-b40b-47b3-b279-f86e107e9cc2/sennheiser_over_ear_headphones_review.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004e8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4E8B 4772 bytes
SHA-256: f90a8dd8cc66c8ea3c691a56cfe8e6799924c95908b5b1e81615bd9f8eb6b4a3
font_01_sfnt_off00005ebb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5EBB 9688 bytes
SHA-256: 8027fb2a0ff8f5d265b9b432501f1c38a85f02546636e710bf7aaa11001b7e10
font_02_sfnt_off00007fea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7FEA 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333