Malicious PDF — malware analysis report

Static analysis result for SHA-256 533716028594dd70…

MALICIOUS

PDF

83.8 KB Created: 2021-03-23 15:20:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 0f9aae26cb60311a0088b6fb4506610f SHA-1: 0fc355a64e4c42b8bc23f60908e2798d5bd016c2 SHA-256: 533716028594dd70468bede3d7080306d801b5d799bf7fc9b727c739e40a44aa
126 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Numerous embedded URLs point to external sites, with several heuristics flagging it as a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. The presence of PDF_URI and EMBEDDED_URL heuristics further supports the attack pattern of directing users to potentially harmful external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

Heuristics 5

  • 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 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://jacksth.ru/wix?keyword=mouth+tsum+tsum PDF link annotation
    • http://tryse.xyz/mixed_costs_consist_of_ahy0vk.pdfIn PDF document text
    • https://xatevixi.weebly.com/uploads/1/3/4/6/134651360/barapexir-sirexak-bijunaja-mezedazetepavu.pdfIn PDF document text
    • http://abanca-electronica.com/narekolubv4cp.pdfIn PDF document text
    • http://lnstagram-helping.live/923274253291n8xp.pdfIn PDF document text
    • https://wafiludelo.weebly.com/uploads/1/3/1/4/131437380/redenasunatikin.pdfIn PDF document text
    • http://oneplusonemain.xyz/44639542534bvuba.pdfIn PDF document text
    • http://insurancesouk.com/56207297635b7nnn.pdfIn PDF document text
    • https://bapoxipen.weebly.com/uploads/1/3/4/6/134684349/nefavivumutife.pdfIn PDF document text
    • https://zodaribidibukez.weebly.com/uploads/1/3/4/7/134716266/e0157.pdfIn PDF document text
    • http://bigmagazin.xyz/calculus_1_practice_exam_with_answerssvg1g.pdfIn PDF document text
    • http://gunepevoxop.66ghz.com/96571791385.pdfIn PDF document text
    • http://rabota-plus.club/dokumules2kwyy.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zefitog.epizy.com/82917007052.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8ee773b1-b441-47ff-8dfc-20e10dce32c9/pedal_power_2_plus_mounting_brackets.pdfIn PDF document text
    • http://puguvapalovuzub.rf.gd/fishing_report_bogue_sound.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9a7ebddb-5e88-4b4f-be1d-88a6074fb5ee/lasisekij.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1619bc7e-5ea8-43aa-ae3b-221f99653f6c/38549884583.pdfIn PDF document text
    • http://nufavonazimu.epizy.com/50495368436.pdfIn PDF document text
    • https://s3.amazonaws.com/muwomapotumugi/checklist_para_diagnostico_empresarial_gratis.pdfIn PDF document text
    • https://s3.amazonaws.com/jevedijadiki/70943119323.pdfIn PDF document text
    • https://s3.amazonaws.com/sabegokek/30061279616.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0bfa1023-659e-40fb-a632-1de263f99a29/bafepabajuxibumeles.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dea44de9-0886-42c8-b435-dbea4fb46ca1/fopem.pdfIn PDF document text
    • http://zukagebogewivur.epizy.com/wemefari.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e0ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0AD 6768 bytes
SHA-256: 2c8be4ab10ba746197bc067f2f6f0559f90ce6c00c9b5edfc41a764d1a426e5b
font_01_sfnt_off0000f797.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF797 4592 bytes
SHA-256: 114999d8177b4b73422a67d69f6ba04c9d2cd27e448ae939b0e4873a936c7327
font_02_sfnt_off0001071b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1071B 10828 bytes
SHA-256: 861ebd4639279ff3c38fa681afa15f9ac39e6477af9dcb3c04240fd48186025a
font_03_sfnt_off00012c4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C4D 16076 bytes
SHA-256: 17dc25ffd8be9e1a817a2a629234721e3af5b7f595c0e59e7e7d47d96463b6cf