Malicious PDF — malware analysis report

Static analysis result for SHA-256 69c5d5dc9c5f97b0…

MALICIOUS

PDF

89.8 KB Created: 2021-04-08 03:56:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 0c3d3fc949bd260f0aacc8a6fdf70c9f SHA-1: bf399754fd4bd3f4bb9205622d4b1e9a061ac959 SHA-256: 69c5d5dc9c5f97b09298d3cb1939bf0e24f1e80442bf27dee0e4b4d723047676
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous external links, a technique often used for SEO spam or to redirect users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as Pdf.Phishing.Trojan. The embedded URLs suggest a phishing or link-farming attack pattern, aiming to drive traffic to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://zajinet.ru/wb?keyword=types%20of%20report%20writing%20in%20research%20methodology%20pdf PDF link annotation
    • https://nijikubu.weebly.com/uploads/1/3/5/3/135347783/150e531e5.pdfIn PDF document text
    • https://kofulunaj.weebly.com/uploads/1/3/5/3/135320514/janixidofa.pdfIn PDF document text
    • https://nosavarugogitov.weebly.com/uploads/1/3/4/4/134488680/setufokon.pdfIn PDF document text
    • https://webemimerur.weebly.com/uploads/1/3/1/3/131380848/5390673.pdfIn PDF document text
    • https://wisufisuzok.weebly.com/uploads/1/3/1/3/131383924/52ee25.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/a94d167e-1ca6-4953-99db-cd7afc06bdad/86518457525.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/580722a6-fc72-46ba-b804-a6d05b04caf3/nusetibos.pdfIn PDF document text
    • https://s3.amazonaws.com/wupixufekijax/45647665291.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e0de8cda-2b24-43f6-81fc-006c74a30dc3/matololozajulapaxevetiz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/249af78e-1a3d-455f-bad8-55be1f2ac154/best_9mm_ammo_for_pt111_g2.pdfIn PDF document text
    • https://010f2e21-25ca-4560-806d-08cbbb7c7db1.filesusr.com/ugd/74a852_628cb3b86bf741259887d0daf35c0cae.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fogibi/maytag_neptune_washer_filter.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/45129483-6d39-4183-9862-44da04684268/toro_blower_vac_bag.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/24bd48c1-f76a-4966-8695-721840b36923/how_did_the_great_depression_affect_the_world.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0fa268bb-8ada-4f4a-96e7-3eb19ae22f5b/86694505078.pdfIn PDF document text
    • https://s3.amazonaws.com/napejaxosinages/69018029544.pdfIn PDF document text
    • https://s3.amazonaws.com/nuxepiduded/nivitajarafimur.pdfIn PDF document text
    • https://c44f4a6d-8922-4093-a150-c9e6b6244fdd.filesusr.com/ugd/b371d9_242db6ea24754b3b8b8d1d2c0473fa4c.pdf?index=trueIn PDF document text
    • https://bea00909-aa88-4d38-ac88-e56db460b486.filesusr.com/ugd/923104_4cce6072268245aab7c8eee6f08e496c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f621ba39-ea04-424b-bc44-917bd402eabd/gatagudafute.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/de0a1104-4de7-4300-b60e-10f879ecbdfc/red_cross_first_aid_refresher_course_nz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a8be5253-3ca3-4f8d-97d0-de8429444304/mipozux.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010a0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A0D 5712 bytes
SHA-256: 1c00d56580bb4f7ecc6b198f8173f5b83db325485e4eebb4caa0090196ceed9c
font_01_sfnt_off00011d6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D6C 10996 bytes
SHA-256: 13c2cd9154e49a22c5596153c51426921cf8fd35e36241fd18835e294eebf5af
font_02_sfnt_off000142b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142B2 16060 bytes
SHA-256: 2173a1880e9f774f759393e7d0d28dda91d04d8a3eae6bea41b822770b343b90

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