Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fa6a0615c99cfa2…

MALICIOUS

PDF

84.9 KB Created: 2021-09-17 12:23:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 601c6bc5c7c69151228a64b35f665a13 SHA-1: 2288852813f1ef5cbfb13b3c5834af6bf8222239 SHA-256: 1fa6a0615c99cfa27f495c7fbfa0c2f1044fe1a707f4fa2ab19431f5cf99f2d2
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs and is flagged by ML classifiers and ClamAV as malicious, indicating a phishing or malware distribution attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests a deliberate effort to obscure the true destination through a network of disposable domains. While no scripts were explicitly extracted, the nature of the embedded links and the overall detection suggest it's designed to redirect users to malicious content, potentially leveraging embedded JavaScript for exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://coretry.ru/uplcv?utm_term=blackjack+app+android PDF link annotation
    • http://kimhoatra.vn/upload/fckimagesfile/fuwuzexepaxagerewuxi.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/161374bc1ed052---32533307790.pdfIn PDF document text
    • https://alarrabnews.com/images/content/content/file/74845252450.pdfIn PDF document text
    • http://sunway.me/uploads/file/1010251569.pdfIn PDF document text
    • http://dylogistics.com/userData/board/file/tizipobajibateduvisasetob.pdfIn PDF document text
    • https://www.area-tlc.com/public/ckfinder/userfiles/files/10806860501.pdfIn PDF document text
    • http://logicamail.it/draft/media/98358381917.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/16134453479c11---90651470898.pdfIn PDF document text
    • http://orkoien.com/userfiles/files/57710454014.pdfIn PDF document text
    • http://naasschoolofmotoring.com/fckeditor/userfiles/file/dovanujut.pdfIn PDF document text
    • http://cestovni-postylka.eu/userfiles/file/37548237738.pdfIn PDF document text
    • http://detskypohar.cz/upload/file/punumaxopejomowas.pdfIn PDF document text
    • http://zawodydrwali.pl/app/webroot/userfiles/file/jugomimedo.pdfIn PDF document text
    • https://masihpt2.com/contents/files/repexonulatuxabuxoga.pdfIn PDF document text
    • http://xn--dlek-5qa.com/admin/UserFiles/file/xipaxagutot.pdfIn PDF document text
    • http://2016.letnifestiwal.pl/ckfinder/userfiles/files/75574982505.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/31028274895.pdfIn PDF document text
    • http://ristoranteibucanieri.it/userfiles/files/ragigumoxepim.pdfIn PDF document text
    • https://thic.net/plugin/ce1/ckfinder/userfiles/files/54281683345.pdfIn PDF document text
    • http://slhospital.com/upload/fckeditor/file/diseremuzerun.pdfIn PDF document text
    • http://geluidsadviesnederland.nl/ckfinder/userfiles/files/69777780750.pdfIn PDF document text
    • http://polishingmarblefloor.it/userfiles/files/vomerulobutade.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_off0000e80e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE80E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010025.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10025 10384 bytes
SHA-256: 7165b8695638874d57579161af8846b9b80e703650ed12ca83ec1039bbda0ff9
font_02_sfnt_off000117a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117A6 17896 bytes
SHA-256: ab520e9996008fcc06ec11655b818f99c1a878a0b779f1983640976b2134b027

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