Malicious PDF — malware analysis report

Static analysis result for SHA-256 2329b9e0aa414538…

MALICIOUS

PDF

88.9 KB Created: 2021-09-17 23:13:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: dda81d5cdd1ecaa7f1a603fb5afcea75 SHA-1: 2c9a3c94290c1960a4d7c711c6d0345b1d1ad7bf SHA-256: 2329b9e0aa414538344348fa04dfd542182dbd5d03715d257df98162c4dc23e8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of a phishing or trojan distribution. It contains a link farm with numerous URLs pointing to PDF files hosted on various domains, suggesting an attempt to distribute malware or phish for information. The presence of a 'how to download hack games' URL further indicates a lure for potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://thaymanhinhlaptop.com/userfiles/file/74576721392.pdf In PDF document text
    • http://stin-verdon.fr/assets/Image/files/vebajeruxibuke.pdfIn PDF document text
    • http://stefani.cz/fck/file/4055489125.pdfIn PDF document text
    • http://sanfrancescovet.com/userfiles/files/36815894477.pdfIn PDF document text
    • http://sonhanint.com/uploadpic/sun/files/202109121227114670.pdfIn PDF document text
    • http://studiotecnicobergamaschi.it/userfiles/files/tebejerozajekoxaw.pdfIn PDF document text
    • https://polymadeniyaglar.com/fckeditor/userfiles/file/89400025335.pdfIn PDF document text
    • http://elpijisystem.com/file/66510195633.pdfIn PDF document text
    • https://majubesar.org/contents/files/68644412685.pdfIn PDF document text
    • http://idroter.org/userfiles/files/padabedinufupavi.pdfIn PDF document text
    • http://btfa.tw/upload/files/vikoxaji.pdfIn PDF document text
    • http://ingmontagna.com/userfiles/files/92296632532.pdfIn PDF document text
    • https://limberhurstgallery.com/imageuploads/file/91573833527.pdfIn PDF document text
    • https://belitour.ir/basefile/belitourir/files/fepomelivuti.pdfIn PDF document text
    • https://globalybm.com/ckfinder/userfiles/files/1630505518.pdfIn PDF document text
    • http://www.amedna.com/userfiles/files/78357732348.pdfIn PDF document text
    • https://kenkochaya.com/user_data/ckfinder/files/gutavo.pdfIn PDF document text
    • https://bulgariapools.com/contents/files/41051759471.pdfIn PDF document text
    • http://artsar.pl/userfiles/file/vuguweme.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614046af60ff1---19231937964.pdfIn PDF document text
    • http://cravaluos.com/ckfinder/userfiles/files/domupaferifotedij.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/65e82b2c0cebd10780b1bf71092f9fde/bixalalisorivap.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=how+to+download+hack+games+in+iosPDF 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_off0000f2b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010ac3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AC3 18948 bytes
SHA-256: 3895bcab8fad8a90068e04dcf5500ddf292fe1a10949d385772aaa4cb6c893a7
font_02_sfnt_off00013bed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BED 10888 bytes
SHA-256: c2a1c8c2493aa866cd9f42130d8a2e7156e62b96eafb929aba104bfd9c045a83

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