Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f1b6f8cadc85322…

MALICIOUS

PDF

97.5 KB Created: 2021-02-03 00:47:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: b6e57fa03a55c2c6b95124d6c6c15a0d SHA-1: b8e3cb0e20fc2400d9d86e501b3619e0faec66db SHA-256: 9f1b6f8cadc85322862aa05fd868c41adb8df8715a7759ab6f83be5d9e36df1a
226 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.001 PowerShell

This PDF document is classified as malicious by ML models and ClamAV, and exhibits characteristics of a link farm designed to host numerous other PDFs. The 'SE_CLIPBOARD_COMMAND_LURE' heuristic indicates the document instructs users to copy and paste content into a shell, a common tactic for executing downloaded payloads. The numerous embedded URLs, many hosted on disposable domains, suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 7

  • 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.
  • 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
  • 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/123?utm_term=acetyl+acetone+polar+or+nonpolar PDF link annotation
    • https://xukifunizagopo.weebly.com/uploads/1/3/4/0/134013279/5a68eb9.pdfIn PDF document text
    • http://grinallex.shop/possessive_adjectives_spanish_worksheetpspwx.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469850/normal_5fef3c8d3899b.pdfIn PDF document text
    • http://therarbooks.com/map_marker_free_downloadxdzqp.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4493920/normal_5fe0f349236e7.pdfIn PDF document text
    • https://cdn.sqhk.co/nupozifulija/jdaQsjj/68054064445.pdfIn PDF document text
    • https://wanomumopanud.weebly.com/uploads/1/3/1/3/131379193/namatofazowil.pdfIn PDF document text
    • https://dumetokewip.weebly.com/uploads/1/3/4/3/134394823/5eea7356a1.pdfIn PDF document text
    • https://nerilumasufut.weebly.com/uploads/1/3/1/4/131437044/6055881.pdfIn PDF document text
    • https://xafokakiza.weebly.com/uploads/1/3/2/7/132710638/1060019.pdfIn PDF document text
    • http://lnstagram-copyright-supports.com/get_likes_and_followers_on_instagram_appkjt5a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421062/normal_6019d4df2ccbb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470832/normal_5fd7d5796c4ee.pdfIn PDF document text
    • http://csxmoney.info/gutschein_amazon_prime_filmeq1noe.pdfIn PDF document text
    • http://fitdieta.com/kelezibumc7lzn.pdfIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tinijev.epizy.com/vip_adblock_apk_free.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://www.gnu.org/licenses/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00011471.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x11471 13528 bytes
SHA-256: ed8c45cbe843e95f1c76a5f2226d8350c6e1a4a97672ab8006300d504b050379
font_00_sfnt_off000103e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103E6 4840 bytes
SHA-256: 3edeef92c47dd82d4df7d0d3064f20359a5918c47d257bda2091ef7da00841a6
font_02_sfnt_off000139ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139FF 11748 bytes
SHA-256: 07e3d7309c16052a568a4ea6f5f6f458fe0c0eec8a26912507fe839d3d4d2654
font_03_sfnt_off00016247.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16247 16272 bytes
SHA-256: 7761c03b31675708768206eefbc0e9cf7f48acb919f6e55e9f769c848bbfa516

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