Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6bda07236958990…

MALICIOUS

PDF

91.9 KB Created: 2021-03-29 02:03:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: e36a6e2eaceef76b3d35a02addc8c230 SHA-1: e76ff7418a1825ee08422819f41d218c38600d13 SHA-256: a6bda0723695899014779469ad18ba2733de8e67d20393be08ea25cc6614f793
214 Risk Score

Malware Insights

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

This PDF document contains a large number of embedded links, many of which point to redirector infrastructure and potentially malicious sites, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK and PDF_SEO_LINK_FARM heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the primary attack vector appears to be the embedded malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://dafemum.ru/award?keyword=class+12+physics+notes+pdf+aglasem In PDF document text
    • https://static.s123-cdn-static.com/uploads/4374704/normal_5fe2dec53b5c6.pdfIn PDF document text
    • https://kipopedetazezu.weebly.com/uploads/1/3/0/7/130775623/322232.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450898/normal_5fffe802031b9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385021/normal_60202749aeeb1.pdfIn PDF document text
    • http://socialwave.me/voduzidusonixonegexejefiesjrc.pdfIn PDF document text
    • http://unosital.space/rokuko8slk8.pdfIn PDF document text
    • http://hushseo.online/fokudigoj6ath9.pdfIn PDF document text
    • https://vowebaxuzifov.weebly.com/uploads/1/3/0/7/130738870/ecc325a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419828/normal_5fde53649fb73.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://s3.amazonaws.com/zaxawetawupo/video_maker_app_for_pc.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/de431c80-f705-40e2-9b30-9b914be990b8/gidelifisil.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/beb2cff1-f5d3-413b-9a4a-4b98e755d0ef/runenuwisekafasug.pdfIn PDF document text
    • https://s3.amazonaws.com/sizadagazagaj/blue_cross_blue_shield_federal_reimbursement_forms.pdfIn PDF document text
    • https://s3.amazonaws.com/widiku/adobe_air_latest_version_for_android.pdfIn PDF document text
    • https://s3.amazonaws.com/naxozelozude/how_to_cyberflix_on_roku_tv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b90e61dd-5724-4307-b29d-cea78e59ff88/how_to_set_armitron_watch_alarm.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/94bcc713-3a1a-49c2-9a50-1457dec0ef34/lukawav.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_off0000fd75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD75 5664 bytes
SHA-256: 28961ca04fa34d2658e6bdc0e7ec7b62495e5a587e82b1d223eb741bae6e8906
font_01_sfnt_off000110aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110AA 12532 bytes
SHA-256: 8b1cbc914955ff944825c1f43991489343b8ac7c0952a0c1c5923587a5b0bd71
font_02_sfnt_off00013b8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B8F 16088 bytes
SHA-256: 7b61b80ad9eae8da687db589656cc14036b78b470666db3a00a61726a6371a4d
font_03_sfnt_off00015081.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15081 4048 bytes
SHA-256: 2b118e047e6223796ea595b267c9f975ba5c8d94a201308845857e52465402fd

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