Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d92c06d63c6b3e3…

MALICIOUS

PDF

71.4 KB Created: 2021-03-12 09:30:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: cebe4975bd9b92a6b90c8dc0cef70ab8 SHA-1: 94ffc78e77bfc096dd44e5aa0970ed52c4f2071c SHA-256: 4d92c06d63c6b3e328a88528661e35fe5e885b1d44fe9e02eb5485eb69251e88
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 0.9991

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://nipisod.ru/wix?keyword=tank+trouble+4+unblocked+games+66 PDF link annotation
    • http://dimax-matrasy.ru/best_luxury_online_shopping_sites_usa2g017.pdfIn PDF document text
    • https://faliroralomi.weebly.com/uploads/1/3/0/8/130874474/rixavofit.pdfIn PDF document text
    • https://taduvovu.weebly.com/uploads/1/3/1/8/131871704/ec4d681684d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389792/normal_601480af77e46.pdfIn PDF document text
    • https://fogojokiverowur.weebly.com/uploads/1/3/0/9/130969702/muvid.pdfIn PDF document text
    • https://pawikewam.weebly.com/uploads/1/3/4/4/134445239/1404949.pdfIn PDF document text
    • https://bapixive.weebly.com/uploads/1/3/4/3/134393773/gidelexutadoged.pdfIn PDF document text
    • https://rinulokol.weebly.com/uploads/1/3/4/8/134868038/menixuk-vuzumiv-xofezuro.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414500/normal_60275aa3a49e4.pdfIn PDF document text
    • http://liolika-rsya.ru/kovojizuponapaxoved1idus.pdfIn PDF document text
    • https://jafobepajimo.weebly.com/uploads/1/3/4/8/134881918/6f9bf917fc08c.pdfIn PDF document text
    • https://sowibize.weebly.com/uploads/1/3/5/3/135348762/gixan_zebegazexena_bolekuduvedol.pdfIn PDF document text
    • https://dewufore.weebly.com/uploads/1/3/4/8/134857007/c252ad06270.pdfIn PDF document text
    • https://kojozoxilasa.weebly.com/uploads/1/3/5/3/135302893/261e041.pdfIn PDF document text
    • https://suvewuvasalu.weebly.com/uploads/1/3/4/7/134762181/914b2e2.pdfIn PDF document text
    • https://mudobimug.weebly.com/uploads/1/3/4/8/134853100/264212.pdfIn PDF document text
    • http://all-gopro.com/lyrics_little_drummer_boyy2r47.pdfIn PDF document text
    • https://faremuxonebaw.weebly.com/uploads/1/3/4/5/134598019/budaxux.pdfIn PDF document text
    • https://jufavufopu.weebly.com/uploads/1/3/4/3/134340263/57301aa.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/f0ce3195-fb45-46e7-9def-3c4be7a5cb0c/how_to_implement_coso_framework.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a32e2b8-fa3f-489d-add2-d9948c584aba/focusrite_scarlett_2i4_2nd_generation_drivers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/235dc8e3-1bd0-40c2-b108-693f92652833/mazowivezo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ae010e38-ff11-454c-94fa-a34d680d4023/zavapuvogogawivawux.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_off0000cde6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDE6 5488 bytes
SHA-256: 3b3886a4d67195d3878eb3b69ae8c6f8f81dd54549ebc51eba5613e45621e308
font_01_sfnt_off0000e07d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE07D 9788 bytes
SHA-256: bfb23371012e72ab718b1631b42a0d9dcd2fe3dc89e6b072791f7db3adefbdae
font_02_sfnt_off000101e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101E6 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378