Malicious PDF — malware analysis report

Static analysis result for SHA-256 58ce57d8aacd75e6…

MALICIOUS

PDF

70.2 KB Created: 2021-09-17 16:55:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 7ea6d480d682ab6276da9e4d1b291442 SHA-1: 89c6021f803b42ab6f62996170e6f6ad14a2c8e8 SHA-256: 58ce57d8aacd75e627ef904ba75e63ad95372261b48a2cb047516be60a97fbf8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of a link farm with numerous URLs, many pointing to suspicious domains, suggests a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing lure, likely intended to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 5

  • 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.
  • 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 http://davidhammerstein.org/ckfinder/userfiles/files/torokagoluzewirewub.pdf In PDF document text
    • http://tensoinox.com/userfiles/files/14330713005.pdfIn PDF document text
    • http://oa30us.com/userfiles/file/mepefoka.pdfIn PDF document text
    • http://finproekt-msk.ru/userfiles/file/zivasawekazubopexexe.pdfIn PDF document text
    • http://jan-fotografie.nl/upload/files/3832857763.pdfIn PDF document text
    • http://netcentricnj.com/ckfinder/userfiles/files/92289173452.pdfIn PDF document text
    • http://gardena.crazyrockinsushi.com/uploads/files/pikadiseb.pdfIn PDF document text
    • https://www.pessin-location.fr/ckfinder/userfiles/files/34910155319.pdfIn PDF document text
    • http://otvorene-srdce.sk/userfiles/file/30193131597.pdfIn PDF document text
    • http://oresteruggiero.com/userfiles/files/jikidex.pdfIn PDF document text
    • https://jdrum-music.com/uploads/ckfiles/files/545504789.pdfIn PDF document text
    • http://letresorellebio.it/userfiles/files/gemaxufaxomebu.pdfIn PDF document text
    • http://canadianartistic.com/userfiles/file/kepitu.pdfIn PDF document text
    • http://secretlove.ch/ckfinder/userfiles/files/7797036177.pdfIn PDF document text
    • https://people11people.com/uploads/File/golofarepekiwujaje.pdfIn PDF document text
    • http://aasghsflqsae.handylover.com/upload/files/guzidinifirizar.pdfIn PDF document text
    • http://studioambienteterritorio.it/userfiles/files/12458386769.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/16130d34bc63d6---14796537361.pdfIn PDF document text
    • https://mytopics.it/uploads/file/31697679798.pdfIn PDF document text
    • http://benthanhsgfarm.net/images/uploads/files/sejoxavugegunobom.pdfIn PDF document text
    • https://belitour.ir/basefile/belitourir/files/wekulegenuwosikanewose.pdfIn PDF document text
    • http://balletpanov.com/uploads/files/dovabevazitezogil.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=download+game+booster+x+gameplay+optimizer+apkPDF link annotation
    • 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000af81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF81 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c798.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC798 11332 bytes
SHA-256: 08e6eaa825e720ee55456166db5683029c2221913109cd80bff9ab124753742b
font_02_sfnt_off0000e1e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1E6 15516 bytes
SHA-256: 06aecd36a2b45c5e1b8ae206a116bd017889f8fc36f0cc7c8c5fd302bec02388

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