Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d864cf6f640442d…

MALICIOUS

PDF

84.9 KB Created: 2021-09-10 05:46:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 34b3b6c1a671611264bead9d5ec61e73 SHA-1: 08a19eaaf518b375d76087a3fe1ff8a9c6257160 SHA-256: 9d864cf6f640442def6f746e7e4b9515e8670f89943f02e31b249fd9e7de7c03
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 indicated maliciousness, and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic confirms the suspicious nature of the linked content. While no scripts were directly extracted, the primary attack pattern involves redirecting users to potentially malicious external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://laborke.ru/uplcv?utm_term=everything+i+never+told+you+read+online PDF link annotation
    • http://hometextiles-consultant.com/ckfinder/userfiles/files/23848325061.pdfIn PDF document text
    • http://maynenkhiinverter.com/media/ftp/file/gijutekebavibubak.pdfIn PDF document text
    • https://zniczekowalczyk.com/user_images/file/33024988854.pdfIn PDF document text
    • http://bakineshr.az/ckfinder/userfiles/files/dunokebuvuzuxaweju.pdfIn PDF document text
    • https://tourgardan.com/basefile/tourgardancom/files/bujejako.pdfIn PDF document text
    • https://tramhuonghanoi.vn/upload/files/26623971713.pdfIn PDF document text
    • http://dominoliberec.eu/images/file/files/tetife.pdfIn PDF document text
    • http://narcisse.sk/editor_uploads/files/zewinewelusozikidevovotuw.pdfIn PDF document text
    • https://gfwofficial.com/ck_imgs/files/pekazoluvimal.pdfIn PDF document text
    • http://dtjxbpzx.com/filespath/files/20210907140241.pdfIn PDF document text
    • http://studiolegaletrotta.eu/userfiles/files/13514152767.pdfIn PDF document text
    • http://www.pavimentosyreformasferlu.es/ckfinder/userfiles/files/35901191701.pdfIn PDF document text
    • https://perfecthospitals.org/FCKeditor/file/88264372807.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/161348e9612ec6---sidowuwewodo.pdfIn PDF document text
    • http://agro-pasz.pl/ckfinder/userfiles/files/gewizowijedavo.pdfIn PDF document text
    • http://xn--e1aaafipco3bk8gra3b.xn--p1ai/upload_picture/file/74570485701.pdfIn PDF document text
    • http://gearcon-eng.com/file_media/file_image/file/bakutul.pdfIn PDF document text
    • http://pk.mo/userfiles/file/82858378112.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132265dab1dc---dixabovunujupedarofeluviz.pdfIn PDF document text
    • http://kaithompson.com/userfiles/file/namabomizibizebode.pdfIn PDF document text
    • http://kino-cosmik.ru/sadm_files/bepifilenojekuvebokuj.pdfIn PDF document text
    • https://franciscovalles.comtraining.cl/userfiles/files/51327329221.pdfIn PDF document text
    • http://salukool.ee/upload/userfiles/file/72880142858.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_off0000e754.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE754 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ff66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF66 18084 bytes
SHA-256: 0fdda0e91458ffed7d90e3f505a8ca6c443e20c3a595d0c4226066c10c8bf254
font_02_sfnt_off00012e30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E30 10620 bytes
SHA-256: 1f64a1e729807e2d0257ec3f996ff56cab3ede6409754c15d15f4328a49fa07a

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