Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7b16e13bfb33be8…

MALICIOUS

PDF

99.5 KB Created: 2021-09-19 08:36:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 298306f67a4a30bf8b4e2356cce9079f SHA-1: cbb55d20a9906eb921ac8f216e163b62800c5e75 SHA-256: e7b16e13bfb33be86deaf8e688ef91c904f770c8d26f4509b5b26ce538db0e0b
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs and a heuristic firing for 'Payment redirection / bank-detail change lure' indicates a phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of external URIs and a link farm on disposable hosting further supports a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • 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://pistant.ru/uplcv?utm_term=how+to+change+my+phone+to+4g+network PDF link annotation
    • http://elcolono.net/userfiles/files/wavukafujiguvegumeliputok.pdfIn PDF document text
    • http://kavtas.com/images_upload/files/26708000106.pdfIn PDF document text
    • https://newfrio.com/userfiles/files/wulexidijabixo.pdfIn PDF document text
    • http://gostinica-domodedovo.ru/files/86783359090.pdfIn PDF document text
    • http://pzhjintai.com/upload/files/43831158836.pdfIn PDF document text
    • http://shop-exclusive.cz/userfiles/file/dezesiremegavatokoz.pdfIn PDF document text
    • http://condosworld.com/abisol1/userfiles/files/50213771649.pdfIn PDF document text
    • http://gdgom.com/upload/file/210908135611348530dmy9a9b6r3ni.pdfIn PDF document text
    • http://monteconsultants.com/image/upload/File/pezuni.pdfIn PDF document text
    • http://nsdadventist.org/FCKData/file/82185524737.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/ecf109a81d96c5b9a467a514d7f5b9db/37931894753.pdfIn PDF document text
    • https://klcconsulting.eu/klc/file/72362000892.pdfIn PDF document text
    • https://golf-tout-terrain.com/publish/page/file/89010459533.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/caabf43ca55dcdf1d5ac397fb5b44cf7/6283854544.pdfIn PDF document text
    • http://atanasijornet.net/uploads/ckfinder/files/pawevoteferatovonufof.pdfIn PDF document text
    • http://actinq.nl/upload/file/nekofokidaxofuneje.pdfIn PDF document text
    • http://learnersdigest.org/userfiles/file/11304383252.pdfIn PDF document text
    • http://adhunikjewellers.com/ckfinder/userfiles/files/busoporuf.pdfIn PDF document text
    • http://0048.pl/48files/file/64897178875.pdfIn PDF document text
    • https://telenovella-bg.com/files/pisafafirumu.pdfIn PDF document text
    • http://vipnjl.com/userfiles/files/wawetije.pdfIn PDF document text
    • http://www.ondebiz.com/userfiles/file/61738965324.pdfIn PDF document text
    • https://kurtoglumob.com/upload/file/88071571155.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_off000120d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120D1 10876 bytes
SHA-256: 020fd4f8117050ce2e9bd0d746df7af96a15e250c18820109ebaf1581cff2104
font_01_sfnt_off000139d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000151eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x151EB 17636 bytes
SHA-256: c4881780bf5ec93999391d9cf7cf69c8a631908c1ded5ccf3a6af3af3fa32b39

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