Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1cf137145490992…

MALICIOUS

PDF

68.9 KB Created: 2021-09-27 04:13:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: fcdae65844b34a303fcfe1d4cdf7d5b6 SHA-1: 1f79eaa1682472da4dff15fc08deb6e5f8700a45 SHA-256: d1cf1371454909925529bd15e98e67146caaff7f2a36c14287a07e4182933537
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs and is identified as a link farm on disposable hosting, suggesting a phishing or spamming operation. Although no scripts were explicitly extracted, the PDF structure and embedded URIs point towards a redirection mechanism to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

Heuristics 5

  • 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.
  • 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://irlanc.ru/uplcv?utm_term=ios+co+op+games PDF link annotation
    • https://www.greenlakecruises.com/ckfinder/userfiles/files/metufuxuvegiwosopatovefis.pdfIn PDF document text
    • http://danguykhoidoanhnghiephp.vn/Upload/files/nokivanefopi.pdfIn PDF document text
    • https://farmacieitaliane.com/documenti/file/98698650999.pdfIn PDF document text
    • http://mimarkamilozkartal.com/userfiles/files/41277336759.pdfIn PDF document text
    • http://newkontakt.ru/userfiles/images/file/xokedilivijevi.pdfIn PDF document text
    • http://dekogard.net/deko/veri/_files/20413503501.pdfIn PDF document text
    • http://www.w.radeton.cz/ckfinder/userfiles/files/kejijakeravuxevob.pdfIn PDF document text
    • http://parentini.it/userfiles/files/82931330612.pdfIn PDF document text
    • https://ckmusicdesign.nl/userfiles/file/6916061107.pdfIn PDF document text
    • http://mikomisushiwc.com/uploads/files/81506701971.pdfIn PDF document text
    • https://girilawfirm.com/content_files/files/35302767209.pdfIn PDF document text
    • http://wonikquartz.com/upload/editor/file/1631336601.pdfIn PDF document text
    • http://assisdrive.pt/userfiles/file/vigafeniguki.pdfIn PDF document text
    • https://mkontakt.pl/dat/file/47635921793.pdfIn PDF document text
    • https://textosolutionslinguistiques.com/upload/editor/file/sedelolekixijofutirunipig.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/wevexaxopubi.pdfIn PDF document text
    • http://tuvanluatdanang.com/upload/ck/files/28985167435.pdfIn PDF document text
    • http://haiqi-machine.com/d/files/16334128450.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/16133100e27c01---2921178008.pdfIn PDF document text
    • http://3e3i.com/UserFiles/file///3711819180.pdfIn PDF document text
    • http://levne-pohary.cz/UserFiles/File/wudujepajagusuton.pdfIn PDF document text
    • http://grupafurman.pl/!mag2011/userfiles/file/47871282984.pdfIn PDF document text
    • https://bushregenerators.com/userfiles/files/61770767164.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/386dbf112c52fe0a28d8c14a289accf1/zufinalikozisovasim.pdfIn PDF document text
    • http://azs-szermierka.pl/zdjecia/fck/file/40836510936.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_off0000afae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFAE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c7c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7C0 15828 bytes
SHA-256: 46fa57281ddfc0ba4666af29879ac880b4351de147ed1fe7c62482b0c6f64321
font_02_sfnt_off0000efb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFB2 10228 bytes
SHA-256: ac3ede39385177fecd7d8061ccb09e823182a16ff4bb01ea761a9ec6337a5cfe