Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b912ddaf9814300…

MALICIOUS

PDF

96.6 KB Created: 2021-03-17 17:12:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: f5b1eee6b86bc76dac5c5b591123dc17 SHA-1: 53621cdf673e86e89a90f5131f9d47611fb24c92 SHA-256: 8b912ddaf9814300d43af1b76e845b8ed8f093d2b1cd36d0f36e111a96aa2f19
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://soxebez.ru/award?keyword=cordon+umbilical+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4448536/normal_6020b3b75b876.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458618/normal_5fd22e8f157dc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382779/normal_600c5d434685e.pdfIn PDF document text
    • https://tozubovudifudi.weebly.com/uploads/1/3/5/9/135973827/7546151.pdfIn PDF document text
    • https://duzuvopewawufos.weebly.com/uploads/1/3/4/4/134491429/8290432.pdfIn PDF document text
    • http://lefibipefazefep.mypressonline.com/how_to_use_combat_knife_resident_evil_2.pdfIn PDF document text
    • http://silujokiz.mypressonline.com/essential_elements_2020_eb_alto_saxophone_book._1.pdfIn PDF document text
    • http://sesizuxewewax.mygamesonline.org/9104092872.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376625/normal_5fd8ec46ef750.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/d3fe8728-c1d4-4bd0-9bc5-cd3b27e9bd82/38575435898.pdfIn PDF document text
    • https://d12e84a0-9808-45da-82c6-613dfe540d1b.filesusr.com/ugd/dc8a8e_45252832de5240939e0dbdf435950142.pdf?index=trueIn PDF document text
    • https://45f91bdd-2b68-4e60-ae2c-b14373ae5332.filesusr.com/ugd/0d089b_d161f46c1f3f43f2b4079d732816a0a3.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xefejevife/ei_reporting_service_number.pdfIn PDF document text
    • https://4adff18d-dc39-4349-be2c-eeb12737f1cb.filesusr.com/ugd/9117e0_ff19c7c0fac74ba5addec12ba1d0deb6.pdf?index=trueIn PDF document text
    • https://1ac5d900-0c69-4f12-8b1d-4e209472b8d2.filesusr.com/ugd/828753_5bae02f6098c4674a7d8e32b6c2c03dc.pdf?index=trueIn PDF document text
    • http://xuxalonitu.onlinewebshop.net/asp.net_interview_questions_and_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/varolexexus/gasinojuvewiwolavule.pdfIn PDF document text
    • https://s3.amazonaws.com/tezude/the_story_of_oj_lyrics_az.pdfIn PDF document text
    • https://s3.amazonaws.com/donake/barcode_scanner_attachment_for_android_tablet.pdfIn PDF document text
    • https://305aa2e3-e1d2-413d-aa2e-f1bb83d03ded.filesusr.com/ugd/92ee2b_703889f854ea4fbb9ae55d1f3f8d58db.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rejiner/graco_high_back_booster_seat_expiration.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9abc5dfb-fc8a-4967-8886-ead93e9e5afd/99095290660.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_off00013a30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A30 5168 bytes
SHA-256: 6c91060d50b553ba4e637bff88ca043be0538ea61d7966b9827aa0d26966ad97
font_01_sfnt_off00014ba3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BA3 12636 bytes
SHA-256: 90f1b8734b028aa00b757932a8827c472bd6850cdb262f56c97a3c499f51e2c7