Malicious PDF — malware analysis report

Static analysis result for SHA-256 61a214c921a88e3d…

MALICIOUS

PDF

78.9 KB Created: 2021-09-08 22:02:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-25
MD5: fb0d9b8e19cdd2aaf6e0dbcd18a64dc2 SHA-1: 7c621876262319a2227af15f1168c4831759fe87 SHA-256: 61a214c921a88e3dbddd5b9cd1edb58dfbf69407ef262aeddf8bb5e87a2aab87
106 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1539 Steal or Forge Credentials

The sample is a PDF document identified as malicious by an ML classifier and exhibits characteristics of a credential phishing lure. It contains numerous embedded URLs, many of which point to disposable hosting and are structured as link farms, suggesting an attempt to obscure the true destination or distribute malicious content. The heuristic 'SE_MFA_LURE' strongly indicates the document's purpose is to harvest credentials by requesting MFA or one-time code confirmation. No scripts were extracted from this sample, but the presence of embedded URLs and the MFA lure point to a phishing attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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://chcial.ru/uplcv?utm_term=how+do+i+check+my+icloud+email+on+android PDF link annotation
    • https://actionsporting.com/userfiles/files/35290545490.pdfIn PDF document text
    • https://photofetimages.com/3350160474.pdfIn PDF document text
    • http://xn--vb0b83rba554gca.kr/page_data/file/20210906161330.pdfIn PDF document text
    • https://krantiservice.com/ckfinder/userfiles/files/64790865282.pdfIn PDF document text
    • http://mkconline.com/landmark/ckfinder/userfiles/files/40614347097.pdfIn PDF document text
    • http://abnig.friendship-match.com/upload/files/jadumefemaxigetakativa.pdfIn PDF document text
    • http://uniontsg96.ru/admin/ckfinder/userfiles/files/xabupivixutonanikixub.pdfIn PDF document text
    • http://namngonviet.vn/user-/files/73834820278.pdfIn PDF document text
    • http://a-pluset.com/userfiles/5674595472.pdfIn PDF document text
    • http://lasermedia.cn/userfiles/file/gibopetelatawixas.pdfIn PDF document text
    • https://electroagro.es/pub/files/68207256455.pdfIn PDF document text
    • http://magnumprint.ru/upload/files/gisadetet.pdfIn PDF document text
    • http://automozg.by/upload/editor/files/66740084686.pdfIn PDF document text
    • http://massiimo.com/piceditor/file/giravutiranotur.pdfIn PDF document text
    • http://cornaredo.gattinonimondodivacanze.it/themes/userfiles/files/dubolufuzajesuluvudejuf.pdfIn PDF document text
    • http://malagi.pl/user-files/fck/file/5116925429.pdfIn PDF document text
    • http://hillsclinic.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/78801894642.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_off0000d03a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD03A 17456 bytes
SHA-256: 1885e7aad415aa11f61d3b92b6846cf11dfe0a567bfd1f9221185cc5c3d0cc2d
font_01_sfnt_off0000fdfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDFC 10752 bytes
SHA-256: b9fe70817621c06c91f5ae6cb39df7a7b8d1fe460b79ce40dba7fc13009ab314
font_02_sfnt_off0001167d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1167D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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