Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a8740aac6460b70…

MALICIOUS

PDF

66.2 KB Created: 2021-03-22 16:18:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 32183bd391d25463a9a4367d27379f89 SHA-1: 52c7c4aed67a867078433e92f37da0d9351a385c SHA-256: 6a8740aac6460b70c925c1da7467a63e8f03d81b0b3194abac980985c76ffcf7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9998

Heuristics 5

  • 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 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://seumenha.ru/wix?keyword=transparent+translucent+opaque+worksheet+ks2 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4459792/normal_605237a6d3bba.pdfIn PDF document text
    • http://metryck.info/venusazewunuxosegupuzugu4gpnb.pdfIn PDF document text
    • http://wabefovelixi.66ghz.com/divopigijanizupokiles.pdfIn PDF document text
    • http://findssldz.xyz/eotech_512_battery_cap_pre_200985uun.pdfIn PDF document text
    • http://dvestideyli.xyz/9391782232222ml9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425238/normal_60447ca35a682.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/aaf96d1b-16b6-4093-b1ec-3a9b54e4396b/rekodu.pdfIn PDF document text
    • http://tuxexagixib.rf.gd/73880137617.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf6ec584-7a77-48d4-b28c-f0062fa66b98/niveles_de_lectura_mapa_mental.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/021b1b8b-8ac5-4298-b4cb-cb610950055b/lefesiwemuraluni.pdfIn PDF document text
    • http://duvaneloxa.epizy.com/bootstrap_registration_forms_3_free_responsive_templates.pdfIn PDF document text
    • http://diruxepuf.epizy.com/songs_of_war_movie_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8de21a80-f2c5-4c4d-81ca-a3e3360a8a8a/adobe_premiere_pro_free_download_full_version_for_pc_2020_crack_getintopc.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/29d37748-3a91-4fed-b68b-f1e3362c139e/dubikaxatunufil.pdfIn PDF document text
    • http://lesadesar.rf.gd/pomamewadobejebububab.pdfIn PDF document text
    • http://famefikapipu.epizy.com/24229094619.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ea09bf63-6ef7-402f-8a6f-ffabed7b173e/what_are_the_types_of_supply_chain_management.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c571.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC571 5384 bytes
SHA-256: 7e68c4918d251e8d913b3105b2160ee91cc401a1f07978d394b90c29c3d37d04
font_01_sfnt_off0000d7d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7D1 9976 bytes
SHA-256: ff2dadc662fa9f0ee53bbd81285e0bc085af274d564889e910f960a0535c32ea