Malicious PDF — malware analysis report

Static analysis result for SHA-256 a833f9993170b5e0…

MALICIOUS

PDF

82.4 KB Created: 2021-09-19 01:53:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a54fea70bd682e3a5ea83569338eabcb SHA-1: 10169e0d547a92b73f0f23bc19f01eb0856bf7d1 SHA-256: a833f9993170b5e00890ecd1442c25953778622bf1f8572019305642010151b0
146 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URIs, with a medium-severity heuristic flagging it as a link farm on disposable hosting. One URI points directly to an IP address, indicating a potential attempt to bypass domain-based defenses. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://palami.by/images/file/6732824073.pdf In PDF document text
    • http://terminsk.by/pics/files/fegeximepapegefuxadarubux.pdfIn PDF document text
    • http://leinerpakgelatine.com/survey/userfiles/files/kazipazebeso.pdfIn PDF document text
    • http://skpizzasubs.com/uploads/files/24049688643.pdfIn PDF document text
    • http://etre-belle.su/images/file/1566354395.pdfIn PDF document text
    • https://alansglobalservices.com/ckfinder/userfiles/files/41128705515.pdfIn PDF document text
    • https://www.natursany.com/ckfinder/userfiles/files/16756333756.pdfIn PDF document text
    • http://kondicionery-lubertsy.ru/upload_picture/file/zideritunavolozotov.pdfIn PDF document text
    • http://reklama-v-sochi.com/ckfinder/userfiles/files/24212699157.pdfIn PDF document text
    • http://ahlhy.com/uploads/file/080219333303.pdfIn PDF document text
    • http://www.dogwoodagility.nl/ckfinder/userfiles/files/35647265728.pdfIn PDF document text
    • http://wwsm-us.com/files/file/zakigolibokiber.pdfIn PDF document text
    • http://140.121.125.49/ckfinder/userfiles/files/20210917_145007.pdfPDF link annotation
    • https://xn--80aesyq.xn--p1ai/files/file/bawegakonolarunoferalaru.pdfIn PDF document text
    • http://9275522-travel.com/userfiles/file/55488290598.pdfIn PDF document text
    • http://umrllc.com/userfiles/files/popoxeku.pdfIn PDF document text
    • http://akpanlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/46933714280.pdfIn PDF document text
    • http://artstudiodesign.it/userfiles/files/10306818110.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/3d5404b4bd58b48840b1728fab29fdbb/pobisobafivuwas.pdfIn PDF document text
    • http://ghalemdi.com/userfiles/file/36555202455.pdfIn PDF document text
    • http://studiolauramoschini.it/userfiles/files/nojafusugeta.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/161312aca0ff0d---lejotaxidadubokazuramuwal.pdfIn PDF document text
    • http://furniture83.com/upload/files/22990895849.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=fifty+shades+of+grey+free+watch+onlinePDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC8D 10932 bytes
SHA-256: 67d57f94cc8a1ef9d529d282fcfbd1e5e5c222bba9def48176fa07f97e6198c1
font_01_sfnt_off0000f5ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5AD 17744 bytes
SHA-256: 3a8f7781c47248252368ad8c33b5f818126d7d1ba8ef41debc543ffa837d4531
font_02_sfnt_off000123c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1