Malicious PDF — malware analysis report

Static analysis result for SHA-256 510ba5d251bd9754…

MALICIOUS

PDF

76.4 KB Created: 2021-06-08 00:28:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 6a4c36d658bf0eab18f9fc665a74f902 SHA-1: c42dfc92ef182fc199a29d5aa860b5f3b4f3fe03 SHA-256: 510ba5d251bd975458310cc47b93c0face94fb7e2187ba5e0c88247969abb8eb
186 Risk Score

Malware Insights

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

This PDF document functions as a link farm, directing users to various external URLs, many of which are hosted on disposable domains. The primary lure appears to be a search result for software downloads, as indicated by the embedded URL and document body. The presence of a PDF link farm and the ML classifier's high confidence score strongly suggest malicious intent, likely for phishing or distributing unwanted software.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://pistant.ru/pbw?utm_term=mysql+workbench+5.6+free+download+64+bit PDF link annotation
    • https://pefuxulubix.weebly.com/uploads/1/3/4/7/134730973/3533529.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374379/normal_6036afed1234c.pdfIn PDF document text
    • https://nusavudusegi.weebly.com/uploads/1/3/4/4/134444144/1081999.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393904/normal_5fefd2df0af7f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369153/normal_602ff7a4b99c6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383147/normal_604673d7259b7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492573/normal_605796571427a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450514/normal_5fe391fd96dcb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425255/normal_5fd5fa1d33229.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378845/normal_6057e8ecdb0bd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464541/normal_6021871caf09b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/7305f592-02e0-4ae2-95f8-b02d6a7c4b81/asus_sabertooth_z77_motherboard_price.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/18ae21e7-581f-4ce1-8f5e-bf7243eec7f1/how_much_is_dr_dre_net_worth_2020.pdfIn PDF document text
    • http://tekitejug.pbworks.com/w/file/fetch/144613005/bijoxavonoduzo.pdfIn PDF document text
    • http://bikopatepo.pbworks.com/w/file/fetch/144820422/shawshank_redemption_full_movie_in_hindi_download_filmyzilla.pdfIn PDF document text
    • http://gatunam.pbworks.com/w/file/fetch/144558444/zupodirozifagaz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/80db304c-1723-419b-9c4a-3b0245697c54/screen_brightness_control_not_working_windows_7.pdfIn PDF document text
    • http://pigedigasexu.pbworks.com/w/file/fetch/144670728/a_raisin_in_the_sun_questions.pdfIn PDF document text
    • http://xuvabufoj.pbworks.com/w/file/fetch/144556227/22415599418.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7b2360cf-6f34-4014-bde9-35a163f649b4/vikuwifasuxod.pdfIn PDF document text
    • http://puzavofan.pbworks.com/w/file/fetch/144636879/bamagijimejora.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB3E 6036 bytes
SHA-256: 53e398f546a7f723fbe677d2219295a9fa52c5f000c1fe4a9d1d2614206a78fb
font_01_sfnt_off0000fff6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFF6 10724 bytes
SHA-256: 7230b7a726da759f594c5a85a4ff65b2a2b393710ab0f85baedeb48cf3264baa