Malicious PDF — malware analysis report

Static analysis result for SHA-256 d88b8dbdd12f1fdb…

MALICIOUS

PDF

74.6 KB Created: 2021-04-18 01:57:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 06d6cd0eb1467bb091f42a82c4debbf2 SHA-1: dcc87a3af2c3cbf623f7542301d32a560daa5ccc SHA-256: d88b8dbdd12f1fdb4e50ace947a4c38c2b5282c4ba632dfd6cea5e53302c5846
134 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 and presents a deceptive download button. 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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://mezovuduw.ru/strik?utm_term=sql+server+2014+books+free+download PDF link annotation
    • http://jopkapopka.online/xaximezajusenuxuddmdby.pdfIn PDF document text
    • http://shoop-ft.ru/lumojixovosifub5sidb.pdfIn PDF document text
    • http://dofukatejipoz.66ghz.com/13187692595.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://d8ec88ce-93b1-4b83-b294-7016fd5b5063.filesusr.com/ugd/366252_c01c6250058545f5955c21d0d5a82b28.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/83adf305-5ba5-418d-8abb-8270e5305044/52297433134.pdfIn PDF document text
    • http://kijuteno.rf.gd/latest_bollywood_full_movies_free_2018.pdfIn PDF document text
    • http://kimabajakagun.epizy.com/91587129176.pdfIn PDF document text
    • https://10bc5e17-7652-4c7e-9b43-999b3eb3b021.filesusr.com/ugd/5edc69_6f66a71e2da6430bba2a813f618579b7.pdf?index=trueIn PDF document text
    • https://5b3fc17b-a4fb-4144-9a53-ff617e35bc6a.filesusr.com/ugd/696117_0b4af23fe4274d20812d0964f2b721ea.pdf?index=trueIn PDF document text
    • https://1c019786-7048-4615-837a-ae53f087c4ae.filesusr.com/ugd/8b4172_93db1a0ce36f4715b113e4dd73732bff.pdf?index=trueIn PDF document text
    • https://1c54689f-8f60-44d8-8d81-b144d6ea8ada.filesusr.com/ugd/787b0a_f739b770abe547c59bdcbf976f3ebb78.pdf?index=trueIn PDF document text
    • http://nefoxujegodusif.rf.gd/41031451560.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8ea97643-6f84-44e9-8250-379b3de1a782/guvezekusujuniwiw.pdfIn PDF document text
    • http://motozotofo.rf.gd/50858432239.pdfIn PDF document text
    • https://40ba1f7a-6e91-49bb-bbb8-dfbb40a2bc60.filesusr.com/ugd/22bf55_b87dfe129b9a4c0d816383bc2dbec0ef.pdf?index=trueIn PDF document text
    • https://12c48f50-3553-44c7-a31c-19fc5df83d07.filesusr.com/ugd/7e0eb0_02f7b2757255449b9af89ec5155d59ee.pdf?index=trueIn PDF document text
    • https://19f621d4-ab03-49b5-bf1d-c78de40104d4.filesusr.com/ugd/bc84a3_fa1e900a59864798ab332df91183e6fb.pdf?index=trueIn PDF document text
    • http://sopomamexuse.rf.gd/82334094571.pdfIn PDF document text
    • https://6f0a1f77-3195-4c90-aae7-8e5805bb56bd.filesusr.com/ugd/f94fd0_f9f0ca16c99c49f6af8b5677afdd5164.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_off0000e33f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE33F 5900 bytes
SHA-256: e56c1b8877d66ab59a97d47d508d9ae29c154ac39a192117be94b043f61aec00
font_01_sfnt_off0000f781.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF781 11116 bytes
SHA-256: 50e5eb81c20139c4525eef4ca3940d4d74770461156c202db24466665aa807fe

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