Malicious PDF — malware analysis report

Static analysis result for SHA-256 319a7e22faf791b0…

MALICIOUS

PDF

69.6 KB Created: 2021-09-26 22:46:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 059862c0ba6c9861a1d1a86a3cf0362b SHA-1: f3ad20209035024f6a366fcad2fb1598e0fa64f8 SHA-256: 319a7e22faf791b0705ef98549a6961ddc163cab4281af5a8a225b0a2dc561d0
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier strongly indicates maliciousness, and the presence of external URIs suggests an attempt to redirect the user to potentially harmful content. No scripts were extracted, but the overall structure points to a malicious redirection or phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://crysiq.ru/uplcv?utm_term=how+to+delete+call+log+on+android PDF link annotation
    • http://hoanhaochemical.com/uploads/files/dexemikomub.pdfIn PDF document text
    • http://medi-sen.com/files/files/vegofozopudafeguwidu.pdfIn PDF document text
    • http://paraglider24.de/pics/fotos/1/file/riwipevipefibur.pdfIn PDF document text
    • http://traktorpulling.de/ablage/userfiles/files/74342898028.pdfIn PDF document text
    • https://duproject.com/uploadEditor/files/92324341294.pdfIn PDF document text
    • http://janjoling.com/public/ckfinder/userfiles/files/43634236437.pdfIn PDF document text
    • http://s-pack.kr/userfiles/file/20210917074217.pdfIn PDF document text
    • http://ain.proximeo.com/ckfinder/userfiles/files/zugaxalabisepar.pdfIn PDF document text
    • https://247christianity.org/fckeditor/userfiles/file/xufisosipigab1631193351.pdfIn PDF document text
    • https://idd.no/ckfinder/userfiles/files/84910394475.pdfIn PDF document text
    • http://usa-ex.com/images/blog/file/xedoxuremekulepalas.pdfIn PDF document text
    • http://stickerbarcode.com/file_media/file_image/file/kirifim.pdfIn PDF document text
    • http://studiotecnicomancini.eu/userfiles/files/fedotirufipu.pdfIn PDF document text
    • https://minhkygroup.com/luutru/files/4869947098.pdfIn PDF document text
    • http://staceyasp.com/UserFiles/file/62114653313.pdfIn PDF document text
    • http://trineckevzdelavani.cz/webpagebuilder/ckfinder/userfiles/files/loroliz.pdfIn PDF document text
    • https://newcar-rental.com/uploads/files/202109090349199711.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/6ieke4ri2mpva2m939g8hcl556/84328372891.pdfIn PDF document text
    • https://inprovitbrasil.com/ckfinder/userfiles/files/97637871221.pdfIn PDF document text
    • https://gozdekadife.com/resimler/files/24428629628.pdfIn PDF document text
    • http://rentaruedas.com/files/others/27605179865.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_off0000ae3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE3A 16744 bytes
SHA-256: d7e58b5ecb92a9c70038c8f823f70790fabe7ef261bcbd879d1b37ac82feb7eb
font_01_sfnt_off0000d959.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD959 10452 bytes
SHA-256: dac9e980c570ea9b1c6f64d7fddf5dfd4809f058efabec54bc75c38c7d39af41
font_02_sfnt_off0000f0f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0F9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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