Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad54f35a0f88656f…

MALICIOUS

PDF

82.4 KB Created: 2021-03-15 11:49:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: b5aecebaab52dc7202b3a6e2f9aeac06 SHA-1: 5a9fd38f65c559fc7be6340a7817731fa90dbdea SHA-256: ad54f35a0f88656f52375bb2a08ba6b4bcb08d377b5cf41efc56e0841de5bb29
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links to various domains, many of which appear to be disposable hosting. This behavior is indicative of a link farm, often used for SEO manipulation or to distribute further malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution, hence the classification as 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://kuzutuzo.ru/award?keyword=cardiac+arrhythmia+treatment+pdf PDF link annotation
    • https://gunagejosiva.weebly.com/uploads/1/3/0/7/130738835/deridijugoba_powazelabutuja.pdfIn PDF document text
    • http://zomoxoxuriw.mypressonline.com/dewalt_drill_saw_combo_kit.pdfIn PDF document text
    • https://cdn.sqhk.co/wixikinotu/uHnjdhg/stickman_and_shotgun_3_mod.pdfIn PDF document text
    • https://tipowunukal.weebly.com/uploads/1/3/4/3/134355136/nisefiwokuxojiz-kofif.pdfIn PDF document text
    • http://xitabijasava.getenjoyment.net/the_odyssey_book_13.pdfIn PDF document text
    • http://lubenoredeji.mypressonline.com/17080000479.pdfIn PDF document text
    • https://dufinatako.weebly.com/uploads/1/3/4/3/134317719/kokarivo_xokumeronilimow_jupumeginafejig.pdfIn PDF document text
    • http://hq-cleartv.info/hector_manuel_vidaurri_aguirre_matematicas_financieraswrvaf.pdfIn PDF document text
    • http://taxevidel.medianewsonline.com/54926292858.pdfIn PDF document text
    • http://idealslimitaly-ufficiale.site/angelcare_bath_support_chairnw8l3.pdfIn PDF document text
    • http://vukufitu.mywebcommunity.org/39230334933.pdfIn PDF document text
    • https://pilidikuvitas.weebly.com/uploads/1/3/4/7/134766888/1058779.pdfIn PDF document text
    • https://cdn.sqhk.co/waxobakal/guhdFhg/standoff_2_apk_obb_rexdl.pdfIn PDF document text
    • https://cdn.sqhk.co/tumupowe/Eljihga/64293816343.pdfIn PDF document text
    • https://suxokigivulumu.weebly.com/uploads/1/3/4/4/134479742/dezumebetisalobajo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://8eeb1f0a-0cdd-4c66-98a4-83777b49fb54.filesusr.com/ugd/64f9d2_84548515c2124ed184236b3f5b64d8d0.pdf?index=trueIn PDF document text
    • https://ecad98c5-3f79-4b5a-9309-7060426a101e.filesusr.com/ugd/66ec94_81e65f3d3533483eb4414e948fe57ebe.pdf?index=trueIn PDF document text
    • http://sizosuxexe.epizy.com/naroto.pdfIn PDF document text
    • https://66f9544f-8325-470d-a543-c07714603334.filesusr.com/ugd/4b2642_0f13372f663e41d091887697ea797bd7.pdf?index=trueIn PDF document text
    • https://4adff18d-dc39-4349-be2c-eeb12737f1cb.filesusr.com/ugd/9117e0_9b4a3b976a5c4a88adb94fc6e261dd74.pdf?index=trueIn PDF document text
    • http://fojofediwesifog.rf.gd/miya_bhai_audio_song_pagalworld._com.pdfIn PDF document text
    • https://6b5d12f1-3bbc-48af-9ddb-5430d2fe15e7.filesusr.com/ugd/3bf302_02c0dbc368d2459d9dfe388971271864.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_off0001057d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1057D 5192 bytes
SHA-256: 0ad89d0134358a264b8badee00436c4a457676282bc18348adc5e1b0cfe26089
font_01_sfnt_off00011704.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11704 10976 bytes
SHA-256: 001ea5686a21e5bad94bd34ca7ec4a3d2e629aaf27e14cccb110a09a3adcdb8a