Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae98b38c921289b8…

MALICIOUS

PDF

77.9 KB Created: 2021-04-08 10:43:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 5f5d82b114132989725f02a8059941ca SHA-1: a6cfb071a573eaf40f310dada42d74e04f6a135e SHA-256: ae98b38c921289b80e8297e0342544bad882cb9a291a7265a8ce94e676ef2818
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm or redirection scheme. The ML classifier and ClamAV both flagged this PDF as malicious, specifically as a phishing or trojan. The embedded URLs and the heuristic firings strongly suggest a phishing or malware distribution attempt, likely initiated via a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://bologen.ru/strik?utm_term=how+to+setup+wireless+turtle+beaches+on+xbox+one PDF link annotation
    • https://gitexapovaje.weebly.com/uploads/1/3/4/4/134464395/fininojolosubudo.pdfIn PDF document text
    • http://tokio-2020.fun/wosomop93f81.pdfIn PDF document text
    • https://cdn.sqhk.co/zexatexa/aZofpia/abcd_2_film_song_pagalworld.pdfIn PDF document text
    • http://ewwe.space/attestation_d_hbergement_bnp_paribask0257.pdfIn PDF document text
    • https://wutifanuviwi.weebly.com/uploads/1/3/4/0/134041095/rolafipigegibiwados.pdfIn PDF document text
    • https://cdn.sqhk.co/dipewoduge/cPmoTfl/80999358048.pdfIn PDF document text
    • https://cdn.sqhk.co/tifesijoja/hjieDjq/85132813251.pdfIn PDF document text
    • https://zuxobopabure.weebly.com/uploads/1/3/4/3/134344154/wodaluxax.pdfIn PDF document text
    • http://tekplafond.xyz/pc_emulator_for_windows_87c3zc.pdfIn PDF document text
    • https://cdn.sqhk.co/duwenaxiseve/fxIXurj/susotelud.pdfIn PDF document text
    • https://zunepijubu.weebly.com/uploads/1/3/3/9/133986973/7238b3c6eddfac.pdfIn PDF document text
    • https://cdn.sqhk.co/wodelaganav/cRdy9UT/dialogue_in_a_story_ks2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://f904ef53-caa1-4f0f-8a97-c50675c03ece.filesusr.com/ugd/2f8cea_27cadeaeb1b546ee815293beca9cf053.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/193f3634-ce4f-4fb7-9dd7-4a7d54e14e4a/can_you_play_the_game_of_life_on_ps4.pdfIn PDF document text
    • https://63c5840e-267c-49ed-94d3-fc9f9d8b9c0b.filesusr.com/ugd/8c5bc8_34d2253913cd4761a9c6040cfe7c8c62.pdf?index=trueIn PDF document text
    • https://29aa9d28-cc9d-45fc-8d86-3718b5881c84.filesusr.com/ugd/74c34a_02e7f1f5504e4b18b3315d59ae28b017.pdf?index=trueIn PDF document text
    • https://8eefcaf3-52f5-4123-8be5-b1f0aaeea45e.filesusr.com/ugd/1d3654_0d34e633dd154f39957fe4815d2cee6e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1eff8b80-2c5c-4fa4-9b8e-313cd2ba215f/kaviledut.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/62f798eb-43ea-4263-9679-da1867b670c0/domexerekivogovemofopa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e1439279-2b68-4047-978c-33de94829a9f/how_to_upload_powerpoint_to_goodnotes.pdfIn PDF document text
    • https://832c8a8d-f05d-46e3-9166-97d9de82ace4.filesusr.com/ugd/432509_32f25e6ec143403d8ba59ec8b4e227a4.pdf?index=trueIn 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_off0000f1fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1FA 5284 bytes
SHA-256: 72daf7042ebf44e4b82501e0b0ba127f502a676d884aad7e415f08cbbc18e78e
font_01_sfnt_off000103f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103F7 11484 bytes
SHA-256: 1d2de71b3218c8fd335fef92c3bb29b80144cd8fcdb00a8175c3da56d084794b