Malicious PDF — malware analysis report

Static analysis result for SHA-256 346b60147b4c3474…

MALICIOUS

PDF

70.0 KB Created: 2021-09-19 16:15:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: daa8228eac286fad1541e319accaea69 SHA-1: 731138def0ed8ca9a13e63903bd903adbea213f8 SHA-256: 346b60147b4c347447c8eb0956c3c94f9591c3572d6d15d9a2765feda3a9df25
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm on disposable hosting, containing numerous links to potentially malicious PDF files. The document body was unreadable, but the presence of many external URIs and the link farm heuristic strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://newat.ru/wp-content/plugins/super-forms/uploads/php/files/511f24f0ce9c9910eed268325bcdb86c/xojanavesumuzeb.pdf In PDF document text
    • https://kingwaterpure.com/ckfinder/userfiles/files/jujonirodufodadeki.pdfIn PDF document text
    • http://lifebeachvilla.com/uploads/image/files/wisimigupugivizigemimu.pdfIn PDF document text
    • https://rentcar888.com/uploads/files/202109122219499532.pdfIn PDF document text
    • http://stroykap.com/application/views/stroykap/userfiles/file/56745162668.pdfIn PDF document text
    • https://xn--p3t29jo1ed4o4xw.tw/upload/files/wanaset.pdfIn PDF document text
    • http://hamzalegalservices.com/userfiles/file/53151963779.pdfIn PDF document text
    • http://metall-press.ru/files/48164087436.pdfIn PDF document text
    • http://yjccnc.com/upload/files/81787375520.pdfIn PDF document text
    • http://cke.hk/userfiles/xumulorofipub.pdfIn PDF document text
    • http://www.zaluziemalina.cz/userfiles/file/vavedawumasobumefe.pdfIn PDF document text
    • https://cukimentescukraszda.hu/files/files/57903579746.pdfIn PDF document text
    • http://qhchemicalsfeed.com/upload/files/vamavavikan.pdfIn PDF document text
    • http://cissi.it/userfiles/files/bivedotizububevi.pdfIn PDF document text
    • http://vattucongtrinh.com/userfiles/file/tefatalugifoxefowunov.pdfIn PDF document text
    • http://sipzip.com/userfiles/file/80140749812.pdfIn PDF document text
    • http://e-motyle.natura2000.pl/imgturysta/files/93171800798.pdfIn PDF document text
    • http://juncheng.tw/upload/files/tubapaxurepulibuw.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/nekunevemegufen.pdfIn PDF document text
    • http://osoboebludo.com/ckfinder/userfiles/files/rutenazekarojugerejuj.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16137b7ca95d73---wegevejigaw.pdfIn PDF document text
    • http://raegcafe.com/uploads/files/18983205852.pdfIn PDF document text
    • https://cgeminfos.ma/upload/file/43617044180.pdfIn PDF document text
    • http://flapboxes.com/userfiles/files/9260534613.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=game+change+pdfPDF 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_off0000b3c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3C8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cbda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBDA 15364 bytes
SHA-256: c8840a369c977c64791787a73a9497654697e95f11c2ed78b317c64538addf92
font_02_sfnt_off0000f2fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2FC 10480 bytes
SHA-256: d90b3f754deb2a92efdd42e03e66fe68eb60174ace599f2a159e7fcad1a6955e

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