Malicious PDF — malware analysis report

Static analysis result for SHA-256 3783ec5a19c8c648…

MALICIOUS

PDF

75.8 KB Created: 2021-05-30 00:35:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: cca750f1b9de727876f82e06344db69a SHA-1: 936bf3791fc74d81dcc3e520f77db98d643dba1e SHA-256: 3783ec5a19c8c64888bf39c3a0310ea95c57139a24baf5787e8efc4eb38cd8c0
156 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9998

Heuristics 5

  • 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.
  • 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=new+barbie+games+to PDF link annotation
    • https://nuguzawopaji.weebly.com/uploads/1/3/4/0/134040365/6401750.pdfIn PDF document text
    • https://bomoturu.weebly.com/uploads/1/3/1/3/131384468/e4e209ba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453142/normal_60348625e994d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365594/normal_602e99d998ba5.pdfIn PDF document text
    • https://fadegedisumobe.weebly.com/uploads/1/3/5/9/135992854/sinotewawigog-mosobubawel-lixozewi.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/76ad5279-9213-42d2-933d-289da198642b/how_much_is_a_battery_for_a_2010_toyota_corolla.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e59f88f7-2f0c-4fba-9fe5-bf24bf321f6c/appnana_token_id_hack.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4290829f-6ae7-4ebc-92da-6676a072e955/online_indian_history_books_to_read_for_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/24c9673c-d529-40fe-9b8d-81e8d338aae4/ma_driving_test_requirements.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e4f6059e-7217-4544-be93-1399e0dfa6c6/zoluxiderobim.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/19ab7135-3c09-4522-b3dd-0ea9537c103e/bissell_proheat_powersteamer_pro_tech_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3b22c059-4369-4145-b483-afbb1f109f75/self_attested_manifesto_for_domicile_certificate_up.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/27a53f63-c876-4c4e-bfa5-e68220ff0bb2/how_do_you_wash_a_teddy_bear_without_ruining_it.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/217756e9-ebb1-4dce-9fae-543fb346ef3d/the_wheel_of_time_book_12.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1a0cc14a-93b0-4f7b-9580-4d3a72c56605/sofubozusofuzakul.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/126fff24-f4e5-486d-b359-32b1efb11211/94896083289.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_off0000e863.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE863 5172 bytes
SHA-256: 4d7bd7db508886166204f2400d5441e863fe212ff3e772babf0937b4872e45b2
font_01_sfnt_off0000f9fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9FD 11940 bytes
SHA-256: 69ce9cbb550ab1f15a73ba136ff0ce6896fc0a6398185485d616a642b15917c0

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