Malicious PDF — malware analysis report

Static analysis result for SHA-256 db2578ac6717a137…

MALICIOUS

PDF

76.2 KB Created: 2021-05-07 15:13:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 6bbc0b864988695cb712c7c2b0fa85e3 SHA-1: ae041c6a651db2a4765997a1371cd686070dbfca SHA-256: db2578ac6717a1371a87898d9cc03d17743919d58d1c1c538ea5d68a5f28df02
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 0.9998

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://maypoin.ru/strik?utm_term=c%252B%252B+programming+free+download PDF link annotation
    • http://tifetatujuvib.22web.org/68979565364.pdfIn PDF document text
    • https://cdn.sqhk.co/bewewojiwo/Ujdgegf/vagubexudepawakoxor.pdfIn PDF document text
    • https://cdn.sqhk.co/livukigelo/jdKQhhM/hat_tricks_sports_bar_grill.pdfIn PDF document text
    • http://wumomotetidofe.getenjoyment.net/rosatuluzenibafo.pdfIn PDF document text
    • http://nogibuxaniru.iblogger.org/jojadowubor.pdfIn PDF document text
    • http://nunovoxiwanafuz.getenjoyment.net/multiplying_and_dividing_decimals_worksheets_grade_6.pdfIn PDF document text
    • https://cdn.sqhk.co/kufiremikaf/dichbdg/zombie_apocalypse_2020_countdown.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://79c9c32e-6572-42fd-9c0e-61d057d48a34.filesusr.com/ugd/33a1c8_f2ec98ff5aa947698b72896109307b9d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/acfcf6e9-fd05-4d06-b38a-4684bbebc3ba/18410303146.pdfIn PDF document text
    • https://9b56c271-8e60-4ff0-96d1-8930f8c082f8.filesusr.com/ugd/5a1ab0_d39349b3656844ada860cf753ae20875.pdf?index=trueIn PDF document text
    • https://ddd59a73-be73-4575-bd7b-2e5900175f8b.filesusr.com/ugd/5dc0ef_67305ce6a0184032b774b55d395148d3.pdf?index=trueIn PDF document text
    • https://6acf0ca1-aa41-4771-8b91-54baff69ee7f.filesusr.com/ugd/7d1dc9_e577bdfa4b254789b2606953a949ce8d.pdf?index=trueIn PDF document text
    • https://c7972686-9310-4d97-8ac3-15e828887225.filesusr.com/ugd/8a419d_0bc9d2f2b4154c6bb123b1fe657c8eb6.pdf?index=trueIn PDF document text
    • http://jexiduro.rf.gd/xesoru.pdfIn PDF document text
    • http://joxumokuri.epizy.com/balulowapinagadagiwo.pdfIn PDF document text
    • https://f8d4b294-f952-4a11-85e8-0a3036f9bdaf.filesusr.com/ugd/ad8f3a_df18b2a28f83421db380bdb3784b06c4.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/173fa27a-eef5-4562-aadc-45b49160d24c/los_ros_de_color_prpura_2_latino_descargar.pdfIn PDF document text
    • http://bumejefivoxigo.myartsonline.com/dudodabavuwatelivew.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_off0000ebb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBB5 5180 bytes
SHA-256: 50509169aebe94be8309e38ec27d08a6ef34242c510edf2fb2f58192b5b07e9c
font_01_sfnt_off0000fd53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD53 11352 bytes
SHA-256: 7e7f1a24b734428086ced72378f0dbc4e743106010ef8107f111687b229aefa0

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