Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5dd731c02f643d4…

MALICIOUS

PDF

86.6 KB Created: 2021-04-05 03:49:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 2dafb0603a243185255e35ca995ea5cf SHA-1: da901a1c9f3ca1f9a9159acd99eed0bc57c4b545 SHA-256: d5dd731c02f643d4e26d586dbc8b219187549af85aee890ebcb32c32ddab92d0
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 0.9961

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://seumenha.ru/aws?utm_term=symbolism+lesson+high+school PDF link annotation
    • https://cdn.sqhk.co/tefozakozup/GiaRpDN/48167539866.pdfIn PDF document text
    • https://cdn.sqhk.co/lizubenesowi/jXOv7ha/snes_controller_pc_adapter.pdfIn PDF document text
    • https://cdn.sqhk.co/bosamame/egcijhg/best_caption_for_fb_picture.pdfIn PDF document text
    • https://cdn.sqhk.co/xewazezikufi/Ijjljcw/6224959344.pdfIn PDF document text
    • https://cdn.sqhk.co/nugunexinazo/jgjhZTX/mario_jet_ski_free_online_games.pdfIn PDF document text
    • https://cdn.sqhk.co/letijefa/hdiijcp/pattern_lock_screen_removal_android_zoom_index.pdfIn PDF document text
    • https://cdn.sqhk.co/wupifufexix/o1Y8j3Q/bony_callus_formation_and_bone_remodeling.pdfIn PDF document text
    • https://cdn.sqhk.co/salasereki/Dhcjeii/squad_free_fire_battleground_free_shooting_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/fagisuxupinu/2uhjij9/flipper_fair_pinball_machine.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://6525eaf8-9a42-4119-9fb4-c3d475b3b78e.filesusr.com/ugd/80bfa9_3b789daef87c43389d5f04dd081bb021.pdf?index=trueIn PDF document text
    • https://b46c4cda-4951-41c0-816f-bbf02eee4d9b.filesusr.com/ugd/4ff992_8933efc0be724253bbe8e1d890bcfa25.pdf?index=trueIn PDF document text
    • https://76b44699-1094-4fd8-8d4a-70b7be8159c3.filesusr.com/ugd/c450b2_574874cff59a454b8c92a2a104f0e926.pdf?index=trueIn PDF document text
    • https://562c2315-396f-49d1-9e45-1236e049cb13.filesusr.com/ugd/ec0012_89c44b58684840a58ce0076424ed9274.pdf?index=trueIn PDF document text
    • https://6e37e838-c278-4d46-baa9-25b8497af200.filesusr.com/ugd/fbcb80_2dbf7535596a4b8aa99e42bcd322b481.pdf?index=trueIn PDF document text
    • http://topuwagib.epizy.com/12_inch_star_template.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b4261431-987f-4856-81c3-7d888871464c/reading_the_bible_in_chronological_order_in_90_days.pdfIn PDF document text
    • http://mitudosukekunif.epizy.com/histria_do_brasil_nao_lilia_moritz_schwarcz.pdfIn PDF document text
    • http://susejukeb.epizy.com/doranezedigazakemo.pdfIn PDF document text
    • http://kejipokope.rf.gd/kuvixo.pdfIn PDF document text
    • https://79c9c32e-6572-42fd-9c0e-61d057d48a34.filesusr.com/ugd/33a1c8_e2a36d9a609549448b1fa73d98ad56a2.pdf?index=trueIn PDF document text
    • https://dbba0f06-1911-40f0-8c80-a2638c7f81cc.filesusr.com/ugd/b13fd1_d24aeb63e37c4668b40ec262e9b76a5c.pdf?index=trueIn PDF document text
    • http://kevixavi.rf.gd/97386676578.pdfIn PDF document text
    • https://2571d5ef-7130-409a-b87d-c3fd18a83f30.filesusr.com/ugd/71fc55_10dafbede12e4c97b164acec94513f2b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/807c7bbb-32fa-4d16-bd4a-e713ff50e3d2/time_warner_cable_dta_remote_programming.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0478484e-db0f-4bfb-89cc-3086b9d93818/what_college_has_the_best_electrical_engineering_program.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1eb49260-c24a-42b3-8cf5-72d3e4694ed9/ps3_controller_charger_type.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_off0001155b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1155B 5252 bytes
SHA-256: 0611751101b6d144c026f03793e37c2de43f4d71acf6a5154e66d8c9e9f6bd65
font_01_sfnt_off00012724.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12724 10940 bytes
SHA-256: cce5c2c1387c5e396078df58751528bb283deb15eee708ef47010de4b9ee2240