Malicious PDF — malware analysis report

Static analysis result for SHA-256 88164740a216c4b9…

MALICIOUS

PDF

38.9 KB Created: 2020-11-07 02:42:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: eeddcbe8ddf14d9b4c42701d413ea209 SHA-1: 12980ce4f34dff2d0faa018060b3626f2ac62c91 SHA-256: 88164740a216c4b9cd46b99d9fa9ba7214f6e9a4000fb027245172c2d11a36db
126 Risk Score

Malware Insights

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

The PDF document contains numerous external links, identified as a link farm, with one prominent URL related to 'medela breast pump manual instructions'. The ML classifier strongly flagged this PDF as malicious. The presence of multiple external links suggests an attempt to manipulate search engine results or redirect users to potentially harmful websites.

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=medela+breast+pump+manual+instructions PDF link annotation
    • https://nimorozidu.weebly.com/uploads/1/3/4/3/134373006/9650262.pdfIn PDF document text
    • https://mixorone.weebly.com/uploads/1/3/1/4/131438240/a270023171d3.pdfIn PDF document text
    • https://pamesatigifimes.weebly.com/uploads/1/3/4/6/134639420/9228523.pdfIn PDF document text
    • https://dowisapi.weebly.com/uploads/1/3/4/2/134266119/c5fce8bec4.pdfIn PDF document text
    • https://ditiwudo.weebly.com/uploads/1/3/1/4/131452947/xalibudi_vited_potofesazad_kodenubos.pdfIn PDF document text
    • https://fisotewefupug.weebly.com/uploads/1/3/1/0/131071176/0708d28695305f.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/bifamomove/34592576813.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9750a32e-b2ec-4b1e-84a6-36dd0fdbb0b4/60989832769.pdfIn PDF document text
    • https://lapemebotu.files.wordpress.com/2020/11/71585697742.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d0260bb-fe15-4e31-ae8d-6f5092421793/gezigoremopesipi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f2a46771-ec23-4d82-8abd-6ac5dbc563bd/40769985519.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_off00005b58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5B58 5364 bytes
SHA-256: 5475baf5b53b9e9d5dc54656120b608b2174a14712290105fd2c0d7a3add56e6
font_01_sfnt_off00006d7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6D7E 9868 bytes
SHA-256: bdf197a9384fac7b4172bba7385b777b6e7210599d89ca7a61bfd451a6ce48a5

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