Malicious PDF — malware analysis report

Static analysis result for SHA-256 3aa4158f28aa9152…

MALICIOUS

PDF

73.5 KB Created: 2021-09-14 14:12:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 058c6e63f2ecbd9b28d0f937838b2857 SHA-1: cd369ce183f0024474a6122402eb921931322f9c SHA-256: 3aa4158f28aa91527dad41049425601ccac1b5da732536de2cf7295a52c916c9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of a phishing or trojan delivery mechanism. It functions as a link farm, presenting numerous links to external PDF files, likely serving as a distribution point for malware or phishing content. The presence of multiple disposable hosts and UTM parameters in some URLs suggests an attempt to obscure the true malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://4998horo.gmmwireless.com/contents/files/93944909572.pdf In PDF document text
    • https://leifs-auto.dk/images/file/vogelomotipegoxaw.pdfIn PDF document text
    • https://perfecthospitals.com/ckfinder/userfiles/files/pawojikofokezi.pdfIn PDF document text
    • http://coyada.com/up_images/up_images/binugo.pdfIn PDF document text
    • https://michelbarbot.com/upload/files/31743621381.pdfIn PDF document text
    • http://andreaslasnik.com/data/files/31791004205.pdfIn PDF document text
    • https://ventadeterrenosurbanos.com/userfiles/file/lumubexafamijepokomapu.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613cc9b90bcfc---50284544638.pdfIn PDF document text
    • http://oticonshop.net/ckfinder/userfiles/files/barotogeke.pdfIn PDF document text
    • https://gamepinleri.net/calisma2/files/uploads/59395874773.pdfIn PDF document text
    • http://tygodnikzuzlowy.pl/ckfinder/userfiles/files/tunaxoz.pdfIn PDF document text
    • http://tentimesneedlehill.com/UPFILE/userfiles/files/39011050445.pdfIn PDF document text
    • http://hawaiianhunareiki.it/file/66583778412.pdfIn PDF document text
    • https://hiperaktivite.info/userfiles/files/18644856652.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/1613276a8c6f97---dokolavekuwezuxejabaxawix.pdfIn PDF document text
    • https://gtnet-engine.com/ckfinder/userfiles/files/36829607825.pdfIn PDF document text
    • http://roseeskin.com/userfiles/file/20210914080902.pdfIn PDF document text
    • https://literie-depot.fr/UserFiles/file/39673215968.pdfIn PDF document text
    • http://studiobaldizzone.com/userfiles/files/29277686217.pdfIn PDF document text
    • http://cesvil.it/filesUploads/file/86761142634.pdfIn PDF document text
    • https://hunde-katzen.at/soubory/14836638878.pdfIn PDF document text
    • https://war-old.its.vn/new/userfiles/file/wefadogetolene.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=gta+san+andreas+apk+free+downloadPDF 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_off0000be32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE32 16412 bytes
SHA-256: 84a76ff35433467eab52366a10c9e89a2353d9c91d475bdd58469ba5d51e5f20
font_01_sfnt_off0000e818.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE818 10616 bytes
SHA-256: 659382dbdae58c1690e78691cd97774deb398e35e00fc470a7f6985361d2af2c
font_02_sfnt_off000100a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100A0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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