Malicious PDF — malware analysis report

Static analysis result for SHA-256 156fbd29f95749d1…

MALICIOUS

PDF

80.7 KB Created: 2021-09-20 23:10:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c8d604349543e277941b7de9842aff23 SHA-1: 71648ae4e71181131f310b2a5a3e3698b75bf38d SHA-256: 156fbd29f95749d1008dc519cbed349977b9480c6f20ca221cdbe1d90de9144e
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by a machine learning classifier as malicious. It contains a large number of embedded links pointing to various domains, suggesting a link farm or phishing attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a strategy to distribute links across multiple disposable hosts, further supporting the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 4

  • 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://farmandari-sarvestan.ir/images/news/files/30257722808.pdf In PDF document text
    • http://dragoniresorts.com/userfiles/4314393223.pdfIn PDF document text
    • http://wingmanresearch.com/userfiles/files/vasoromikuv.pdfIn PDF document text
    • https://landtop.com/filespath/files/20210918174932.pdfIn PDF document text
    • http://studiopiergentili.it/userfiles/files/19904924473.pdfIn PDF document text
    • https://tmtteks.com/files/42254798738.pdfIn PDF document text
    • http://noithattamphuong.com/upload/files/giloli.pdfIn PDF document text
    • http://www.cerathai.com/image/upload/File/wononepixidujo.pdfIn PDF document text
    • http://standardamulet.com/files/files/63533632940.pdfIn PDF document text
    • https://digireg.nu/upload/dosozipibe.pdfIn PDF document text
    • http://dalnoboy.org/data/filestorage/upload/files/xizikuv.pdfIn PDF document text
    • http://yer-krasnodar.ru/ckfinder/userfiles/files/zivopomedexibarelotusaf.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/59604573726.pdfIn PDF document text
    • http://studioagm.it/userfiles/files/59098876644.pdfIn PDF document text
    • https://chorland-dining.com/webroot/editor-uploads/files/48790763825.pdfIn PDF document text
    • https://ventadeterrenosagricolas.com/userfiles/file/xerisipepijedavef.pdfIn PDF document text
    • http://kowalstwwo.pl/public/cms/images/file/lakir.pdfIn PDF document text
    • http://avandcie-energy.com/ckfinder/userfiles/files/97291336518.pdfIn PDF document text
    • http://stomerijindex.nl/images/uploads/sebubifa.pdfIn PDF document text
    • http://valeneighbors.com/userimages/30829639528.pdfIn PDF document text
    • http://millenium.moscowfashion.net/content/xuploadimages/file/47703727286.pdfIn PDF document text
    • https://tigapilar.com/upload/files/jolojunuvuvo.pdfIn PDF document text
    • http://biplano.eu/userfiles/files/99053919802.pdfIn PDF document text
    • http://laskod.hu/userfiles/file/80807362864.pdfIn PDF document text
    • http://www.pacautomarketing.com/file/16292272110.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=how+to+change+play+store+region+with+vpnPDF 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_off0000d686.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD686 17320 bytes
SHA-256: ee03870c10d36de502d70e8739d214a17b3b1e22b48feea850bde22d6ab8e110
font_01_sfnt_off00010371.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10371 10908 bytes
SHA-256: f79d1f2b0541029f7dd9fd411019a51071849e24230cd650aa10b29db584dc49
font_02_sfnt_off00011cb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CB2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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