Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a26956f1e9bd475…

MALICIOUS

PDF

45.0 KB Created: 2020-11-06 18:20:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 31b1fc49c250096ab6ee3565de01c875 SHA-1: 3ddadb159ca73b53e3cc6737dd80b9f057779ce3 SHA-256: 8a26956f1e9bd475b88cc25ec2bae3df872aa40b80fdeea7ee5bbb381a887cb5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of external links, many pointing to disposable domains and WordPress/Weebly hosted PDFs. This behavior is characteristic of SEO spam or a content distribution network for potentially malicious files. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious link farm.

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://trafficel.ru/123?keyword=polar+watch+manual+ft1 PDF link annotation
    • https://nofakefol.weebly.com/uploads/1/3/4/3/134341926/gedebuwo_godegexiwekesu_kijudixela.pdfIn PDF document text
    • https://sejejuno.weebly.com/uploads/1/3/4/4/134447194/vakikopibepilono.pdfIn PDF document text
    • https://pezusadoti.weebly.com/uploads/1/3/4/5/134525395/paroxe-jodojazenaked.pdfIn PDF document text
    • https://sefufomoxuve.weebly.com/uploads/1/3/4/5/134528328/kowabeva.pdfIn PDF document text
    • https://gewupokisata.weebly.com/uploads/1/3/4/6/134606569/2649945.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://papunuzane.files.wordpress.com/2020/11/53122877922.pdfIn PDF document text
    • https://kufoboge.files.wordpress.com/2020/11/85827944085.pdfIn PDF document text
    • https://sovikakeko.files.wordpress.com/2020/11/30568097797.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f4b30c39-18e9-48f9-b50d-f99a40554cbc/8861364515.pdfIn PDF document text
    • https://teviwuder.files.wordpress.com/2020/11/wokumik.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/91d7a40c-2e6d-40bd-8a62-19198070362b/89069704088.pdfIn PDF document text
    • https://sigenodob.files.wordpress.com/2020/11/55794755136.pdfIn PDF document text
    • https://lodoxepal.files.wordpress.com/2020/11/vibinofa.pdfIn PDF document text
    • https://s3.amazonaws.com/buxoparadazegu/human_anatomy_and_physiology_systems.pdfIn PDF document text
    • https://monirasuwa.files.wordpress.com/2020/11/gefelosukamipidorubiniz.pdfIn PDF document text
    • https://zomizekakigo.files.wordpress.com/2020/11/vufejelosifibinak.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_off00006f51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6F51 5088 bytes
SHA-256: d85bf16112c953bc82e31f6126a0e0fa2a824573e6bd5e94e9d1d820dc9dd9ab
font_01_sfnt_off00008090.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8090 11416 bytes
SHA-256: 7760b9f7a07fb63d507780064e0dd4eb37bf2b5ecb3464f24f4c0a2b6b7055c9