Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6973912eadbd1ce…

MALICIOUS

PDF

75.2 KB Created: 2021-09-11 10:21:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 436b88a2edda238f11c1505b4fc567b1 SHA-1: 4bf18389dae64a7dc42caea781e44a013876f8af SHA-256: f6973912eadbd1cee28023fa2f46aba1cb9a32e479410946d77b030b347ef8e5
226 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external URLs and is flagged by ML classifiers as malicious. Crucially, it exhibits heuristics for a 'Recovery secret / private key request' and 'Password-protected archive handoff', indicating a social engineering attempt to obtain sensitive user credentials. The presence of embedded URLs and the nature of the heuristics strongly suggest a phishing or credential harvesting attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://archism.ru/uplcv?utm_term=keystore+file+not+set+for+signing+config+release+react+native PDF link annotation
    • https://viettincapital.vn/upload/files/fukipikeno.pdfIn PDF document text
    • https://sportuna.be/ckfinder/userfiles/files/63426572514.pdfIn PDF document text
    • http://dealershop.es/camarasegovia/userfiles/file/kudoduf.pdfIn PDF document text
    • https://dienmayminhchau.vn/uploads/news_file/xeniv.pdfIn PDF document text
    • https://vinocastillo.hu/editor_up/kuwuxazikapoweneropax.pdfIn PDF document text
    • https://keralatemples.info/ckfinder/userfiles/files/fusimevupureted.pdfIn PDF document text
    • https://alkalacarservice.com/public_html/userfiles/file/89747571318.pdfIn PDF document text
    • http://phaptangpgvn.net/app/webroot/upload/files/41622433654.pdfIn PDF document text
    • http://fullerton.kopanramen.com/uploads/files/55975170863.pdfIn PDF document text
    • https://aramlasmerok.hu/uploads/file/39235292729.pdfIn PDF document text
    • http://aadcnfgl.netsociality.com/upload/files/kiwelegekuj.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130534db9184---sakaravunefegelaxe.pdfIn PDF document text
    • https://burgaseguros.com/userfiles/file/53667295528.pdfIn PDF document text
    • https://sma-dfgg.org/site/admin/file/22536179928.pdfIn PDF document text
    • https://myreply.mobi/snappshott/editor//file/3560393801.pdfIn PDF document text
    • http://officeharbor.com/pdtInfo/57668460537.pdfIn PDF document text
    • https://www.temtechnologies.fr/ckfinder/userfiles/files/jeravaginavemex.pdfIn PDF document text
    • http://www.rosabrockenhaus.ch/ckfinder/userfiles/files/44567302024.pdfIn PDF document text
    • https://medbillings.us/lightspeedweb1/file/63959105618.pdfIn PDF document text
    • http://iamsong.vn/uploads/files/pariso.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/1613573eda7e0f---kapagodagag.pdfIn PDF document text
    • http://ct-tci.com/cttax/userfiles/files/sovifupepevisomijidakada.pdfIn PDF document text
    • http://zaintik.org/files/galeria/files/modevisifavanedezikiwu.pdfIn PDF document text
    • http://ingpiazza.eu/userfiles/files/89602116080.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_off0000c078.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC078 17588 bytes
SHA-256: 826fef8ec620d909fcfea56567009bcd88f08205e13bff20dd71e04061af883e
font_01_sfnt_off0000edca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDCA 10680 bytes
SHA-256: 9cfa2ad3516fd099c59d117b6e6887ad3667cb5260e2ba7b19eae5de36efc89a
font_02_sfnt_off00010678.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10678 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1