Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6647deacfb072bb…

MALICIOUS

PDF

77.6 KB Created: 2021-09-21 17:05:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: e35b43a6745eef4a653c6d01f53845fc SHA-1: 1c827937ffcc2864e62a2e4cfff1f14d217f945d SHA-256: a6647deacfb072bb6e78b71754d580a20fa15403595eaafd431555fef09913eb
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous external URIs and is flagged as a link farm, suggesting it's used to redirect users to potentially harmful websites. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 https://archism.ru/uplcv?utm_term=free+cinema+firestick PDF link annotation
    • https://equantumconsulting.com/files/files/88262921503.pdfIn PDF document text
    • http://vpsystem.com/files/fck/54421325142.pdfIn PDF document text
    • https://sibiucuratenie.ro/fckeditor/userfiles/file/72283613634.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/161350a5160d23---kavedemo.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/515234b750c97872bae4a61c54897b97/15828484763.pdfIn PDF document text
    • http://archbot.pl/files/file/19751844733.pdfIn PDF document text
    • https://suprizpin.com/calisma2/files/uploads/vulejojosumuvekat.pdfIn PDF document text
    • https://path.mn/userfiles/files/98444117226.pdfIn PDF document text
    • http://casinodanmarkjackpot.dk/userfiles/file/34283662332.pdfIn PDF document text
    • http://easyreturn.store/userfiles/file/39144440746.pdfIn PDF document text
    • https://xn--espaoldetalca-lkb.cl/var/www/html/upload/file/kajezegutu.pdfIn PDF document text
    • http://kerama.altrodesign.eu/ckfinder/userfiles/files/7510650156.pdfIn PDF document text
    • https://myvideoclasses.com/ci/userfiles/files/mojiwipabagoveka.pdfIn PDF document text
    • https://eingangrad.ch/userfiles/files/42760909852.pdfIn PDF document text
    • http://pc580.cn/upload_fck/file/2021-9-17/20210917191113234608.pdfIn PDF document text
    • http://ytlcases.com/userfiles/file/16375345936.pdfIn PDF document text
    • https://istanbularicilikfestivali.com/upload/ckfinder/files/lajofa.pdfIn PDF document text
    • https://kultmotor.hu/images/files/sesowazarepejufeguv.pdfIn PDF document text
    • https://hazeloyun.com/calisma2/files/uploads/28887659535.pdfIn PDF document text
    • https://himalayanwanderer.com/himalayan/userfiles/files/jojiwupagujofo.pdfIn PDF document text
    • https://smsenerji.com/resimler/files/9254573256.pdfIn PDF document text
    • https://ferado.vn/userfiles/file/rarevoxodogesetowipiwaz.pdfIn PDF document text
    • https://szpital-sulecin.pl/images/fckfiles/file/10736089770.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://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_off0000ca82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA82 17884 bytes
SHA-256: 666b80ad99f2e01b8233af02ef86d772f2e36d5c2c276f3dc982667a82ef306b
font_01_sfnt_off0000f904.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF904 10400 bytes
SHA-256: 2ec8b12aa4c34c0975ab37510ad6a22c8d62737ca2081402aab7f4ec2beb713f
font_02_sfnt_off00011089.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11089 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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