Malicious PDF — malware analysis report

Static analysis result for SHA-256 80473077ffe589ac…

MALICIOUS

PDF

84.9 KB Created: 2021-09-11 23:05:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 2c083c7493b4d98a9908525842d0b0ff SHA-1: d3bc1ba74fe850bbfedd77538f4119e16e9b9e1f SHA-256: 80473077ffe589ac7e306327127a2e5670bd6a16c38be30e32a734435ec6a4d3
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external resources, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to trick users into downloading further payloads. No scripts were extracted, but the PDF structure itself facilitates the attack.

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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 http://kirsanov-maslo.ru/uploads/tunuxaresurimenovopapod.pdf In PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16136962293db4---sujuridavimewusatenekoja.pdfIn PDF document text
    • http://seatraderhk.com/userfiles/16422704759.pdfIn PDF document text
    • http://oldadmin.k12cart.com/media/files/lebemilo.pdfIn PDF document text
    • http://artstudiodesign.it/userfiles/files/3645764685.pdfIn PDF document text
    • http://cafegreenwichvillage.com/uploads/files/29968029230.pdfIn PDF document text
    • http://stickerbarcode.com/file_media/file_image/file/69844705182.pdfIn PDF document text
    • http://as-eng.biz/userfiles/file/fusozutoxe.pdfIn PDF document text
    • http://munnarteabungalows.com/userfiles/file/87898483706.pdfIn PDF document text
    • http://vuason.vn/upload/files/7114238432.pdfIn PDF document text
    • http://dulwichtaxi.com/survey/userfiles/files/50634125428.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161371eb8e4d16---51096576359.pdfIn PDF document text
    • http://mansiya.com/uploadfile/files/63792323006.pdfIn PDF document text
    • http://nontaromclinic.com/ckfinder/userfiles/files/27377905870.pdfIn PDF document text
    • http://sinojjacob.com/userfiles/file/zexubuwikomofokodijezu.pdfIn PDF document text
    • https://egyediajandekotletek.hu/mvc/userfiles/file/sedaredagip.pdfIn PDF document text
    • http://synerfreight.com/syner_upload/images/files/65898221345.pdfIn PDF document text
    • http://ubestsports.com/imager/files/20210909180710.pdfIn PDF document text
    • http://ambulatorioveterinarioscapindandrea.it/userfiles/files/vomijonokizimilulekudi.pdfIn PDF document text
    • https://ncsccalgary.com/userfiles/files/10874514107.pdfIn PDF document text
    • https://fsreloading.com/userfiles/files/jarapovenufobabo.pdfIn PDF document text
    • http://studiogiamberardino.it/userfiles/files/86802552547.pdfIn PDF document text
    • http://poney-club-romilly-aigre28.fr/userfiles/file/78077743493.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=call+locator+apkPDF link annotation
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d0b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0B3 18496 bytes
SHA-256: 6d671324ebbc8dcdebdbf70ac2656dda3d84cff21969c0fce7e274ebc815ae79
font_01_sfnt_off00010083.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10083 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011894.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11894 16448 bytes
SHA-256: 0e4cde3d5bdd5452960de995a4807c8da4ec665155a9812e2f8e54e6c49b7878
font_03_sfnt_off00012f6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F6D 9992 bytes
SHA-256: 86a2b556a38eb5a5795e797fe0b294817f21e78cffda1a611746f03159df386b