Malicious PDF — malware analysis report

Static analysis result for SHA-256 b232dd571a0d55d0…

MALICIOUS

PDF

77.8 KB Created: 2021-04-08 01:27:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 32f3d88462fe7cc744cd36684d01ef31 SHA-1: af019de904788a86fc38b2f99b3ca4a525290a97 SHA-256: b232dd571a0d55d0b2a183295c5ff82e2914338961da80e105da163a608c7760
156 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, a technique often used for SEO link farms or to redirect users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as Pdf.Phishing.Trojan. The embedded URLs, particularly the one pointing to 'jumiwimov.ru', are likely part of the malicious redirection chain, aiming to deliver a payload or phish credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://jumiwimov.ru/strik?utm_term=kreepy+krauly+great+white+manual
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://lanelubeberasi.rf.gd/99274074919.pdf
    • https://65de77fc-0341-4fd2-89b2-cd6b005a91de.filesusr.com/ugd/cf79db_5d9887ae000b49f0ad615ded1e72a525.pdf?index=true
    • https://uploads.strikinglycdn.com/files/820c22a9-4f9a-4964-b4d0-8ae8fa87bcfb/folk_music_english_means.pdf
    • https://uploads.strikinglycdn.com/files/70768c53-e619-44e0-8b9f-af5a03c037a3/71686790710.pdf
    • http://nipuxedexup.epizy.com/deep_freeze_mac_user_guide.pdf
    • https://s3.amazonaws.com/dutuzanob/tintin_comics_download.pdf
    • https://uploads.strikinglycdn.com/files/ad2f4b5f-fcd8-4e98-bf73-f9f2de10ce8a/what_is_the_importance_of_education_essay.pdf
    • https://uploads.strikinglycdn.com/files/ca772f55-1549-4ecf-8fbf-57a0425db239/2004_honda_odyssey_transmission_oil_type.pdf
    • https://bc5ba30c-e427-49eb-abc4-9677f18f04c1.filesusr.com/ugd/bcd086_e6ea8e2c188e43ee843e791ec47fe0f9.pdf?index=true
    • https://be934b08-0dcc-4e2e-8de1-c3c1c32dbfab.filesusr.com/ugd/d5415a_56dfec366b984cdc950170f32878ac10.pdf?index=true
    • https://uploads.strikinglycdn.com/files/1e357b3b-4215-4c84-81a7-4f81814fdfb2/xikuvinonijivow.pdf
    • https://s3.amazonaws.com/xakapudakadu/53865130640.pdf
    • https://s3.amazonaws.com/zidosozawok/cormac_mccarthy_the_road_first_edition.pdf
    • https://d0a6b1b1-1773-4622-8b5e-0ab5990a7ed3.filesusr.com/ugd/b90ba1_59807a2b76f64abcabb8addea140f863.pdf?index=true
    • https://a0d2adcf-75bd-42a9-a42a-c23e1c6e9e1a.filesusr.com/ugd/85c99c_3f63d7c3bd0747cab6abfa8e8754360d.pdf?index=true
    • https://uploads.strikinglycdn.com/files/a62591d4-6f91-4f9c-95b1-623e51673e30/63892241944.pdf
    • http://toxawilel.epizy.com/81425922298.pdf
    • http://xerivigop.rf.gd/resupidazamomajusawa.pdf
    • https://uploads.strikinglycdn.com/files/f7785150-3f46-47a0-9ce3-7b7146a46582/demelet.pdf
    • http://dosazazavepa.rf.gd/bebodiremigutajebewur.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f05d.bin
edd62b2330769240d793cf5bb816ef58f04e6ee6e1bbef8a9986a6e14d9cc1f2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF05D 5284 bytes
font_01_sfnt_off00010249.bin
7613124d5451cefcb8855310575ca0b5c2552eef784f31a47ec7ac16a32e95f7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10249 11676 bytes

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