Malicious PDF — malware analysis report

Static analysis result for SHA-256 2df9fd1f178dc0b0…

MALICIOUS

PDF

83.2 KB Created: 2021-04-06 18:59:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 3ea5993ee2693470da97c8b308eff580 SHA-1: 74468d770ff8d3b44644c5211341a0c4310fca11 SHA-256: 2df9fd1f178dc0b0b4e6f6ec8b4878ff0efbd37852e274b8508f68b8f96bed20
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and 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 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://maypoin.ru/aws?utm_term=how+to+clean+a+whirlpool+bath+jets PDF link annotation
    • https://numuteje.weebly.com/uploads/1/3/4/6/134683694/54b29bfb28126.pdfIn PDF document text
    • https://kavivafome.weebly.com/uploads/1/3/2/7/132740637/2a58d5fb1d9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368221/normal_605133d265f94.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467287/normal_6019bcbe8ae8f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401711/normal_6031f52797b00.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426416/normal_605be3a4c7fd4.pdfIn PDF document text
    • https://kunefenirubineb.weebly.com/uploads/1/3/0/7/130739500/8385228.pdfIn PDF document text
    • https://wapinabukodinu.weebly.com/uploads/1/3/6/0/136051982/mugaxib-mefikibip-wupaz-wojegakuwenugip.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368772/normal_5ff8b4120032a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413017/normal_60184d8fd89bd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373243/normal_5fc9dfba524de.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490121/normal_6027972b399dc.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/22f53a4d-796d-4366-8a80-dd3d0783dc96/48166495383.pdfIn PDF document text
    • https://b1c30c75-ab46-439a-884d-3836ae4b8a49.filesusr.com/ugd/2d1648_1bf1dda5891a4adeab93a3df586a332d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xefezesebusu/71733552678.pdfIn PDF document text
    • https://ebcfae26-b4e4-4f1a-a5b2-c5bdbddc1bdf.filesusr.com/ugd/259f90_bd76b2767d854bb99327faf1a7630150.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vedexajawo/bonk_meme_template.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2d8eddef-822d-4c2c-8102-fdf27cfbbafa/zedalezekakawebukoxeveko.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/91ae3987-5149-45bf-8a43-74c045757df4/all_horde_races_warhammer_2.pdfIn PDF document text
    • https://cee4a208-09ac-40e0-983f-4c2cc776acbe.filesusr.com/ugd/5ed537_99597ebf1ee34e85a54361e3aef62715.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/dede9c28-4caa-4e26-977f-9e34819a32b1/nogufujaloradimezixopad.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_off0000fa3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA3F 5080 bytes
SHA-256: a384406eeb6ae2c87797c8d99facaf06402330f7954f3c913661a09cc42a1c45
font_01_sfnt_off00010b78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B78 10952 bytes
SHA-256: 55722cd1a41684503de92e853acc919ef3c1bf8454b3ed2441d38aa052fcdda0
font_02_sfnt_off000130f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130F8 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361