Malicious PDF — malware analysis report

Static analysis result for SHA-256 8277f3ee8fd16b13…

MALICIOUS

PDF

69.3 KB Created: 2021-09-30 14:21:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: dee941ec07933af98d8f1a3c2286cd82 SHA-1: 82d06d5bd9890a5fea7fb555990cfaa5b4714909 SHA-256: 8277f3ee8fd16b13d9238b74d42f4a5a114b5f1e614cf5dba9d26b5242b8128c
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm, indicating a likely attempt to redirect users to malicious sites. The presence of external URIs and the overall structure suggest a phishing or malware distribution lure.

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://infrive.ru/uplcv?utm_term=how+to+send+mms+without+data+plan+android PDF link annotation
    • http://erpos.sk/data/files/73842597984.pdfIn PDF document text
    • http://originalcheck.it/public/img_admin/file///kutetiwabawudaf.pdfIn PDF document text
    • http://fotografiafrancescosomma.com/userfiles/files/8899247582.pdfIn PDF document text
    • http://zaiger.ru/img/file/45369060262.pdfIn PDF document text
    • http://xn----7sbbbizu2bxaod.xn--p1ai/userfiles/file/tinojoxepidasik.pdfIn PDF document text
    • http://surtek.biz/image/files/20150402_073307.pdfIn PDF document text
    • http://mygotour.com/FileData/ckfinder/files/20210929_6939247B912E92DE.pdfIn PDF document text
    • http://pxmonastery.org/CKEdit/upload/files/bazezoretigakug.pdfIn PDF document text
    • http://worldnaturalfood.com/image/upload/File/15602716013.pdfIn PDF document text
    • http://www.yoko-ono.be/images/userfiles/file/64435763212.pdfIn PDF document text
    • https://www.totalblissbeauty.com.au/application/third_party/ckfinder/userfiles/files/loguwalanabo.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/12570069958.pdfIn PDF document text
    • http://www.wm-meyer.de/meyer/admin/editor/ckfinder/userfiles/files/12357795752.pdfIn PDF document text
    • http://esebtekstil.com/resimler/files/powoxadetogowadebafu.pdfIn PDF document text
    • http://digifast.cz/userfiles/meremat.pdfIn PDF document text
    • https://magnanerie-cazilhac.com/userfiles/file/ketabazoxiti.pdfIn PDF document text
    • http://letnaterasa.customreal.sk/data/files/juximur.pdfIn PDF document text
    • http://mastervin.ru/files/file/nuxinitolujazufomu.pdfIn PDF document text
    • http://140.121.125.49/ckfinder/userfiles/files/20210922_033136.pdfPDF link annotation
    • https://legend-chang.com/UserFiles/files/tovegixoz.pdfIn PDF document text
    • http://ohmamakitchen.com/uploads/files/jopiraso.pdfIn PDF document text
    • http://boldogelet.hu/media/42420598361.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_off0000adb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADB4 10836 bytes
SHA-256: b495bcb4bbad37a551a0d54d2c335f6884c92ffce5573b1ab13574bb94d1625e
font_01_sfnt_off0000c67d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC67D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000de8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE8F 16060 bytes
SHA-256: 2e858a64df79f1da7252da43a3ee83ce7620b9d48db9fbdc8c052ae1829dbe92

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