Malicious PDF — malware analysis report

Static analysis result for SHA-256 5082c99c7b2895dd…

MALICIOUS

PDF

121.9 KB Created: 2021-01-21 06:02:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: f03df4ec5b9dbad4f3f3c735857790c5 SHA-1: c11506337df738ebab51920ed809ef633c0d9f17 SHA-256: 5082c99c7b2895dd9f03d70b9422acbfd11009ff8f6e0574ea22303929c291b5
166 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous external links, many hosted on disposable domains, suggesting a link farm or phishing attempt. Crucially, a heuristic identified a 'Clipboard command execution lure,' indicating the document likely instructs the user to copy and paste commands into a shell, a common technique for executing secondary payloads. No scripts were extracted, but the presence of this lure strongly implies an attempt to initiate command execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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
  • 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://trafffi.ru/123?utm_term=genetics+practice+problems+%25237+dihybrid+crosses+answers PDF link annotation
    • https://site-1252804.mozfiles.com/files/1252804/jituvuxefuzofawasetaw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383930/normal_5f9dca9a5fdfc.pdfIn PDF document text
    • https://site-1172723.mozfiles.com/files/1172723/elements_massage_mindbody_frisco.pdfIn PDF document text
    • https://site-1168130.mozfiles.com/files/1168130/ac_market_apk_2018_android.pdfIn PDF document text
    • https://site-1178040.mozfiles.com/files/1178040/70138676943.pdfIn PDF document text
    • https://site-1200548.mozfiles.com/files/1200548/86267492090.pdfIn PDF document text
    • https://site-1168272.mozfiles.com/files/1168272/43627033924.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478438/normal_5fd7c0fbc86e7.pdfIn PDF document text
    • https://site-1172684.mozfiles.com/files/1172684/40986386044.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495393/normal_5ff2d2e175933.pdfIn PDF document text
    • https://site-1251314.mozfiles.com/files/1251314/deadpool_bgm_music.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381788/normal_5fe8a1bb41995.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389090/normal_5fa26c42b70fa.pdfIn PDF document text
    • https://site-1177769.mozfiles.com/files/1177769/x-_rite_colorchecker_passport_software.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384642/normal_5fa6218e07899.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/liwara/acrobat_reader_free_windows_7.pdfIn PDF document text
    • https://s3.amazonaws.com/zizene/beginning_consonant_blends_worksheets_for_kindergarten.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001a072.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A072 5252 bytes
SHA-256: 40c79a0d1471b05e25cf45c4bfddbcce45ade27dcecb946deec81ddd55024f4d
font_01_sfnt_off0001b235.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B235 11996 bytes
SHA-256: 1364f23ce1f6ffa4f5b9f9c86edc8214445c241cb6928f434265df249913249d

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