Malicious PDF — malware analysis report

Static analysis result for SHA-256 39badb6657598516…

MALICIOUS

PDF

75.7 KB Created: 2021-04-13 17:18:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 1ed2519607f84b2024a419124336990a SHA-1: 56ef0465428f1b11c53c1530053d0632e532324b SHA-256: 39badb66575985164b65afe209e415382e1b176b7857356e4fa5e8afedbeeb7e
186 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 0.9997

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://jacksth.ru/strik?utm_term=us+navy+diver+school PDF link annotation
    • https://lurevovikofa.weebly.com/uploads/1/3/4/6/134693735/c07f3064721.pdfIn PDF document text
    • https://cdn.sqhk.co/kanereneb/jgjePhb/xupujobugotekegoxodugeva.pdfIn PDF document text
    • https://favadela.weebly.com/uploads/1/3/1/0/131070298/13b598f8299.pdfIn PDF document text
    • https://cdn.sqhk.co/fesakesovoka/dhcPXjd/bihar_board_intermediate_exam_date_sheet_2019.pdfIn PDF document text
    • https://cdn.sqhk.co/porosobof/Bhcidfe/panda_galaxy_space_shooter_apk.pdfIn PDF document text
    • https://votokivefanatu.weebly.com/uploads/1/3/1/4/131453133/puvubobuliviselen.pdfIn PDF document text
    • http://femusawar.iblogger.org/isolation_of_fungi_from_air_lab_report.pdfIn PDF document text
    • https://satizivuzaked.weebly.com/uploads/1/3/4/3/134383512/781398.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/bc0506fa-4000-4560-a056-ec5c533e9d3d/99142017139.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ceff3b5e-045d-4745-bca3-befaab80b50d/how_to_start_writing_a_nonfiction_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/704f1216-64fc-4e06-8171-dd34218bc83e/86403058580.pdfIn PDF document text
    • http://zijikekiz.epizy.com/mrp_online_application_form_bd.pdfIn PDF document text
    • http://vigiraporonom.rf.gd/rational_emotive_behavior_theory.pdfIn PDF document text
    • https://d497f082-4895-42de-a72c-038d9367c8a3.filesusr.com/ugd/8e727b_d2344c1ab72444dd85f5865f49e85a4f.pdf?index=trueIn PDF document text
    • https://c84d532c-3b33-47d6-96aa-4134a1164eb1.filesusr.com/ugd/6d45f6_e2ae45943e7e435cab4a0e69c8f5e0e3.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/cd0978b7-9934-4421-a6ff-a8a60f0b6c4f/68545556183.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a6467bea-b209-40ca-b715-3b77f33e955c/roku_2nd_quarter_earnings_2020.pdfIn PDF document text
    • http://senisiluni.rf.gd/sadipubutid.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f2323e87-6eb1-40db-893d-6cbf0ef7e5a9/2017_ford_mustang_gt_premium_price.pdfIn PDF document text
    • https://31f314b5-0768-4c24-bd49-4596ea953b46.filesusr.com/ugd/85a4b1_3c17db58f50d443a93c1b0a184167ba6.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
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB32 5180 bytes
SHA-256: b97c9f2054734bfd9b8dff76039213777a81e15f4e7aa447154f3cdbdf12c233
font_01_sfnt_off0000fcdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCDD 10852 bytes
SHA-256: e86d81c8f0b79c9e7a78460d2ebebf191eb0ef138f75668130875e710e0c5d09

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