Malicious PDF — malware analysis report

Static analysis result for SHA-256 a44b9402f492bb2a…

MALICIOUS

PDF

68.8 KB Created: 2021-09-13 10:00:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d6ca434eba7d0515665f1cec0f8091a9 SHA-1: 59528470a70e5a1e62a6744f4ca00d4db7bc6d91 SHA-256: a44b9402f492bb2a27f15229191996893470a4485b9c2c3992786691dc9478d3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and is identified as a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were directly extracted, the PDF structure and embedded URLs point towards a tactic of directing users to download content, likely malware, from a network of compromised or disposable domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://inwebjor.ru/uplcv?utm_term=hd+streamz+app+download+latest+version PDF link annotation
    • http://arisutour.com/ckupload/files/dokewivoxusokerolo.pdfIn PDF document text
    • http://hotelalbicia.com/userfiles/file/35326250961.pdfIn PDF document text
    • http://xn----7sbjvweekof5d.xn--p1ai/files/files/67502855301.pdfIn PDF document text
    • http://centreforeffectivecoaching.com/media/file/bitusabulitakitozukixemo.pdfIn PDF document text
    • http://contelex.it/userfiles/files/35912858573.pdfIn PDF document text
    • http://gongotour.com/FileData/ckfinder/files/20210913_17AF7D48A8206AE8.pdfIn PDF document text
    • http://ecolservizinettuno.com/userfiles/files/98592294544.pdfIn PDF document text
    • http://vinczeandlaszlo.com/upload/morurilixawumiwelunexe.pdfIn PDF document text
    • http://stonebreaker.at/7742000085.pdfIn PDF document text
    • https://edubox.mn/uploads/users/0/files/joloxuzekekamigujoto.pdfIn PDF document text
    • https://heart-calligraphy.com/uploads/files/202109062302088966.pdfIn PDF document text
    • http://crisismobile.com/ckfinder/userfiles/files/sikilalogivuwop.pdfIn PDF document text
    • http://pathtojanna.com/userfiles/files/munifutunebalimojepanuwe.pdfIn PDF document text
    • http://fc-junajted.com/upload/datoteke/rotemib.pdfIn PDF document text
    • http://gabinetpro.gabinetpro.pl/kosmetyczka/krakow/files/rijigupolixozaw.pdfIn PDF document text
    • http://poliinc.com/upload/files/nufiwujetoz.pdfIn PDF document text
    • http://mtt-association.fr/upload/file/refeze.pdfIn PDF document text
    • http://ibrahimabuomira.com/ckeditor/ckfinder/userfiles/files/12076198308.pdfIn PDF document text
    • https://www.jnvhardoi.org/ckfinder/userfiles/files/58058379518.pdfIn PDF document text
    • https://helices-evra.com/userfiles/file/kujepudapebupera.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613aaf2a28ddb---78567572812.pdfIn PDF document text
    • http://highdesertrent.com/newsite/images/uploads/file/kosoxudizatugev.pdfIn PDF document text
    • http://21cedu.com/pds/userfiles/files/muzijivumoduka.pdfIn PDF document text
    • http://bluelakehomestay.com/uploads/image/files/42512612694.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_off0000af42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF42 14840 bytes
SHA-256: 4b033d7e8c87091c9882e1c7af4707b25c59f201925b5f0b85c75382517a0bdd
font_01_sfnt_off0000d4b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4B3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ecca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECCA 10756 bytes
SHA-256: 05b89a1e6b67e258d6ed832e72aa004f1ee1b80aee33b0b4a5ea2e444eb0c58f

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