Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f173c7cc3b47a52…

MALICIOUS

PDF

85.2 KB Created: 2021-06-08 15:59:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 3f59e5286da4f90f8177cecf24628d04 SHA-1: 422fcb9d896bc09c9db5aa2c525c009e6db57689 SHA-256: 3f173c7cc3b47a527a6f953db263c4bab4b87e117f4e7488472a81372d95ee0b
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 0.9990

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://crophysi.ru/123?utm_term=fintrac+reporting+timelines PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4491671/normal_602bb1277d059.pdfIn PDF document text
    • https://jatekowi.weebly.com/uploads/1/3/0/7/130776123/1049d1444a89c5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416671/normal_6024f51b62bf5.pdfIn PDF document text
    • https://xamezorunag.weebly.com/uploads/1/3/1/6/131606231/nofiru.pdfIn PDF document text
    • https://ximavubakalik.weebly.com/uploads/1/3/0/7/130776508/jimekejer.pdfIn PDF document text
    • https://rekasefuwe.weebly.com/uploads/1/3/0/9/130969231/dosoba-vezije-xoganikujawizu-bunaxupifuj.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4451744/normal_60b75bcd38554.pdfIn PDF document text
    • https://xebivonejawaf.weebly.com/uploads/1/3/4/0/134096192/jetileteju_vokuzogidume_fujagizodode.pdfIn PDF document text
    • https://jebasunegafepes.weebly.com/uploads/1/3/1/6/131637224/70a2317eb06f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4461746/normal_600494379b58a.pdfIn PDF document text
    • https://lexaraziled.weebly.com/uploads/1/3/7/5/137500455/tusikum.pdfIn PDF document text
    • https://fudonorovivur.weebly.com/uploads/1/3/4/6/134665028/wefedipubebotafojewi.pdfIn PDF document text
    • https://jamexujibelesuw.weebly.com/uploads/1/3/4/7/134748805/lumik.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
    • http://jebusolole.pbworks.com/w/file/fetch/144590370/what_is_holy_anointing_oil_used_for.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/546c8580-fc69-40d4-b042-dec7f3ea3e15/lg_47ln5400_hard_reset.pdfIn PDF document text
    • http://faxamom.pbworks.com/f/12646732892.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1df28d27-6e71-481c-a9cf-9d0eb4d791a8/88819534733.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/05fd5c7e-342c-4d9e-a83a-69e1d790c2a5/yamaha_f250_repair_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d5373a6-4757-4b47-a4f3-c035fe96981d/90780245548.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/68e31127-671d-4808-8a2e-fb2f9edad9e4/what_to_know_before_playing_ff7_remake.pdfIn PDF document text
    • http://pulixojesu.pbworks.com/f/ziverugexov.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ad00527f-84fd-49ab-adf6-8711847df53d/que_es_el_problema_de_investigacin.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7ef35c92-fd58-4b7f-aa28-339dfbd01626/535081173.pdfIn PDF document text
    • http://bijinim.pbworks.com/f/grohe_euphoria_260_installation_manual.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_off000100b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100B7 4996 bytes
SHA-256: 8b9221ec296df5c3204d3212b4eafbddab5139d27b971f5d723c9086c66a3e46
font_01_sfnt_off00011191.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11191 11220 bytes
SHA-256: 61494d381465e68c1cf43afde48a3f371bad49ac77cd0f10a9e90d6b88a41019
font_02_sfnt_off00013799.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13799 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71