Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d1dc32661fca518…

MALICIOUS

PDF

91.8 KB Created: 2021-06-05 02:36:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 060378ad44484fe7fde97461d08bf2d1 SHA-1: df641de59cf879786fd6103f3b0941f31b338525 SHA-256: 8d1dc32661fca5181cd332db014fa2a0bf296cde6fd9e6f7123d62facd54283e
196 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1059 Command and Scripting Interpreter T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a clipboard-command (paste-and-run) lure. 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.
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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://pistant.ru/pbw?utm_term=what+are+the+following+things+that+adversaries+want+to+know PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4446273/normal_5fc942b14ecba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370307/normal_605480ae7f154.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481662/normal_605053bdde023.pdfIn PDF document text
    • https://vatipasa.weebly.com/uploads/1/3/0/7/130775610/pokolukolani.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387938/normal_60526380bbd0b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369516/normal_6047e8b52d829.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468274/normal_603d371f2b150.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409246/normal_605ee624eb8aa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447658/normal_606ac271bb78f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446286/normal_6069e32e721c1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454167/normal_5feee25740915.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501632/normal_5fe7ce2cc1dc2.pdfIn PDF document text
    • https://rigefenasoje.weebly.com/uploads/1/3/0/7/130776330/fefulerile.pdfIn PDF document text
    • https://zimivopup.weebly.com/uploads/1/3/1/3/131381614/mubowadogeketov_dizufukorogo_lopiwewiluli_vepuxinanako.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470703/normal_6013ea0aa4340.pdfIn PDF document text
    • https://wugumura.weebly.com/uploads/1/3/4/6/134601103/82977986270738.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485807/normal_6063a6f15aa54.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/f80602f2-ee05-421b-8870-fd541fd5d675/practical_electronics_for_inventors_fourth_edition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/23b9a9b4-e583-441f-abcd-a45d952e5296/how_long_is_the_stock_market_open_on_new_years_eve.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4b7ad3e8-31e0-4a55-9ded-f563f4abe280/61510544909.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/89f69628-3032-4768-a517-7beef1202c5f/19159203237.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_off00012b5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B5E 5396 bytes
SHA-256: 221fc8f5bcac9a606227e13b452c5ba441eb7af4599c798bc19fb1b8b6db89e2
font_01_sfnt_off00013dd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DD5 10480 bytes
SHA-256: d52781e154dd543c4dbceb88c6a1e1d3a2f5c38e222d8f52167eb241cf0fe3cf

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