Malicious PDF — malware analysis report

Static analysis result for SHA-256 7958cb458e1990a7…

MALICIOUS

PDF

88.6 KB Created: 2021-03-23 14:57:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 605723941d9000fe560b21d787bfa1ea SHA-1: 25804ccd73d07863d8f2bf3510cf19fb7b79a61c SHA-256: 7958cb458e1990a7692d94999bb063c24b85da31cbf3fa4c0e64f30c58d5a819
186 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, many pointing to disposable domains and potentially malicious hosting, indicative of a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to malicious content.

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://baarspo.ru/123?utm_term=4k+video+player+apk PDF link annotation
    • https://cdn.sqhk.co/nolovojawek/BgfCbGQ/hyperion_launcher_pro_apk_free_download.pdfIn PDF document text
    • http://xiwesesakuvel.medianewsonline.com/repev.pdfIn PDF document text
    • https://cdn.sqhk.co/zifeduwa/5zjaYja/jofevakugofalijo.pdfIn PDF document text
    • https://cdn.sqhk.co/fiseguvugele/aHrs7r0/pac-_man_ralph_breaks_the_maze.pdfIn PDF document text
    • http://dosijefa.mypressonline.com/molapulirofogabukupobeg.pdfIn PDF document text
    • http://dekiweragaf.mywebcommunity.org/duality_of_light.pdfIn PDF document text
    • http://pivolirarorip.mypressonline.com/l_amant_en_francais.pdfIn PDF document text
    • https://cdn.sqhk.co/rijomawonuj/ifVbifS/parallel_space_multi_account_latest_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/folikulezig/EYZhizb/2843610142.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/2bd09f46-6c8c-46ec-b855-53b82446684d/como_sacar_una_carta_poder.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/043c71cc-cdbb-448f-9854-c85dcb4867f8/how_to_find_grants_for_nonprofits.pdfIn PDF document text
    • https://5ccda086-29c7-4024-8a93-689df1f3b89c.filesusr.com/ugd/ed8107_103af9aa313f4047bec0b0eae5cfba52.pdf?index=trueIn PDF document text
    • https://7722bba5-72ad-4d15-a72d-9ce9fbdcf1b5.filesusr.com/ugd/772ad5_137fbcd43d944b6cbe1652760f8087a7.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/meludav/whirlpool_cabrio_platinum_washing_machine_f_code.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cd697e28-2165-4c22-b324-addf51975f4d/nabajatojuluwifavuboxe.pdfIn PDF document text
    • http://lerumedinopox.onlinewebshop.net/catholic_bible_personal_study_edition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/96af91f6-36be-4b06-a429-44dbf88d1b0a/18955509479.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/29b8778a-1aab-4b18-980c-5a84b68a7683/xokaj.pdfIn PDF document text
    • https://s3.amazonaws.com/wapabefizosumi/acura_tsx_manual_swap.pdfIn PDF document text
    • https://8c4778c4-ed17-4cf1-86f9-5448e21c5c15.filesusr.com/ugd/6da380_07215512e86f4e008f76f4d36e329230.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f3f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3F0 6744 bytes
SHA-256: 0eac1552a6a0cc8d6d43e14f5c157d052ff2bf21460314f67a2c213e0a454e63
font_01_sfnt_off000104d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104D7 4596 bytes
SHA-256: 9be6496c2898eb9ccd9ddc880506526df683838f7ee9def90ff733d5f2978d70
font_02_sfnt_off0001148e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1148E 15676 bytes
SHA-256: 431caaa6a01848f118fcd3dcad613cb1067cc44f66180d6cd73232508776251b
font_03_sfnt_off00014573.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14573 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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