Malicious PDF — malware analysis report

Static analysis result for SHA-256 7444a7ba75446b8a…

MALICIOUS

PDF

79.0 KB Created: 2021-03-07 20:31:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 5d37d5e1db7ccc058847f988bec6a1e8 SHA-1: 4e2183a7fc72a573bba215c48da3ad436190548a SHA-256: 7444a7ba75446b8ae4c7e81edbb279684be62c5d8607a32fbb022ee1ba2cc163
226 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution T1059.001 PowerShell

This PDF file exhibits characteristics of a phishing lure, indicated by the 'SE_CLIPBOARD_COMMAND_LURE' heuristic. The document's content, though heavily obfuscated, suggests an attempt to trick the user into executing commands, likely to download and execute a secondary payload. The presence of numerous external links, many on disposable hosting, further supports a malicious intent, potentially for SEO manipulation or as part of a larger phishing campaign. The ML classifier strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 7

  • 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
  • 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://ponafet.ru/strik?utm_term=can+raspberry+pi+4+boot+from+usb PDF link annotation
    • https://cdn.sqhk.co/dupeguwova/ibnwHjd/93286835742.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366042/normal_6022cacd535c0.pdfIn PDF document text
    • https://cdn.sqhk.co/zebimapajod/duidijA/54605503037.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443809/normal_5fd614458e1d6.pdfIn PDF document text
    • https://cdn.sqhk.co/vunelebu/DmmojgM/16106374982.pdfIn PDF document text
    • https://cdn.sqhk.co/kixagixupo/JjgihjC/gekuwolorigores.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425010/normal_60312f1356bbd.pdfIn PDF document text
    • https://jerefukixuludew.weebly.com/uploads/1/3/4/6/134686450/tuxapuli.pdfIn PDF document text
    • https://cdn.sqhk.co/luwukamuku/QyPigjc/49203074823.pdfIn PDF document text
    • https://kogijusixi.weebly.com/uploads/1/3/5/3/135312463/ladodope.pdfIn PDF document text
    • https://fezuwarojeti.weebly.com/uploads/1/3/1/3/131383544/4596762.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380691/normal_603b2cc7eb23a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369630/normal_6028617109ac5.pdfIn PDF document text
    • https://cdn.sqhk.co/kakapoxavu/jgLhdih/90s_tv_show_trivia_questions_and_answers.pdfIn PDF document text
    • https://sovopedu.weebly.com/uploads/1/3/5/3/135301682/musod_notimufazumime_nesafufaz_gelidetesud.pdfIn PDF document text
    • http://varerafuvurine.22web.org/panasonic_kx-tge270_specs.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • http://fonobufusig.rf.gd/what_are_the_applications_of_quantum_physics.pdfIn PDF document text
    • http://zazuxevepiz.rf.gd/fifty_shades_of_grey_freed_soundtrack.pdfIn PDF document text
    • http://xamojivegubon.epizy.com/4088464650.pdfIn PDF document text
    • https://s3.amazonaws.com/wopari/google_chrome_apk_for_windows_10.pdfIn PDF document text
    • https://s3.amazonaws.com/tezofuretejom/xasef.pdfIn PDF document text
    • https://s3.amazonaws.com/jawusawar/vaperir.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
    • http://www.gnu.org/licenses/gpl.htmlIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e6d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6D5 5252 bytes
SHA-256: 5326aad61d159033b362e70f79d524a1d66095768a80f43dbd50c44275e40b7d
font_01_sfnt_off0000f89b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF89B 5916 bytes
SHA-256: 26e1fc1704ab7250d256e60b4a9ad5cc7841dc79ab81fa4fb35edcae5a001635
font_02_sfnt_off000107b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107B9 11976 bytes
SHA-256: 8c970fa7ebc718971e6fdc0270361e44be41b38c93c5441fdcad8c4b5e306f6f

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