Malicious PDF — malware analysis report

Static analysis result for SHA-256 31729e9914929fd1…

MALICIOUS

PDF

44.5 KB Created: 2020-11-08 20:40:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 008aacd03d0fdf90038b3aa04b0ba42f SHA-1: d7dd15c7f8c48cb415576ecec38b696a214cd101 SHA-256: 31729e9914929fd184995012674117270b758fa9d7ce92476d1212b20543cc91
66 Risk Score

Malware Insights

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

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 4

  • 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=gel+electrophoresis+lab+report PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4385011/normal_5f8cc7cdda97a.pdfIn PDF document text
    • https://pomudada.weebly.com/uploads/1/3/4/3/134382041/rebanezagabaxig.pdfIn PDF document text
    • https://kuzaloxamuw.weebly.com/uploads/1/3/1/4/131406684/zunujaliga_nobonopogoporen_dezogat.pdfIn PDF document text
    • https://pisanofinupu.weebly.com/uploads/1/3/1/4/131437881/09813f.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/942946a5-d0c6-4a3c-86a0-64f5c8724d94/pai_iso_canton_ohio.pdfIn PDF document text
    • https://jadanadu.files.wordpress.com/2020/11/hand_shaking_meme_template.pdfIn PDF document text
    • https://s3.amazonaws.com/tojazudibumogab/rise_of_kingdoms_lost_crusade_mod_apk.pdfIn PDF document text
    • https://kovipuwixo.files.wordpress.com/2020/11/42635769341.pdfIn PDF document text
    • https://s3.amazonaws.com/kavalukato/ielts_actual_reading_test.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/28c93f37-c647-4a23-bd19-813378cb443a/exponential_and_logarithmic_function.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ec733a67-c623-4d7a-a622-c63f95eef3a7/29037512495.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_off00006425.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6425 4872 bytes
SHA-256: ac0e818008e1fe6019f0d3149d5596df87ca29ba0fc85c9a730c2374ea2700f6
font_01_sfnt_off000074bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x74BB 10272 bytes
SHA-256: 50c92664e2773966f21c90a22c970defffcd137e8a249902be378809b7a1594b
font_02_sfnt_off000097a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x97A4 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e