Malicious PDF — malware analysis report

Static analysis result for SHA-256 c432302bcc36beb0…

MALICIOUS

PDF

77.1 KB Created: 2021-09-24 03:06:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ee6cbc13654abfbd45ae3285d93d00c8 SHA-1: af7d8efb0ce137ba3f92c5c235d82611d515753c SHA-256: c432302bcc36beb062d23e3355b23c438e101b1e53c854c7eea6be1ae5bf34e1
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external links, many pointing to disposable domains, a common tactic for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as a phishing trojan. The presence of embedded URLs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic further support the conclusion that this document is designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 https://philabc.ru/uplcv?utm_term=gba+free+rom PDF link annotation
    • http://propertiesforrent.com/userfiles/file///9139399908.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/94934397778.pdfIn PDF document text
    • http://envisystem.com/upload/userfile/files/zuvorakigutujukikinul.pdfIn PDF document text
    • http://archi-m.ru/userfiles/file/20553971145.pdfIn PDF document text
    • https://ambulatorioveterinariosismondi.eu/file/fekamepedebiza.pdfIn PDF document text
    • http://szyuangang.com/UserFiles/file///gitujurisuni.pdfIn PDF document text
    • https://stomatoloska-ordinacija-rijeka.com/files/regazopaxula.pdfIn PDF document text
    • http://regmac.net/userfiles/files/todowenorelinefitatujune.pdfIn PDF document text
    • https://satesayap.com/contents/files/fasupalipanozo.pdfIn PDF document text
    • https://tefen67.com/userfiles/files/bawitovuxanaxokunuxedix.pdfIn PDF document text
    • https://leganordavigliana.it/uploads/file/simedazexiximubedud.pdfIn PDF document text
    • http://duet-czluchow.pl/userfiles/file/sejoxotifedakineloxi.pdfIn PDF document text
    • https://www.libyamonitor.com/sites/all/libraries/ckfinder/userfiles/files/41995317620.pdfIn PDF document text
    • https://basisnomor.com/contents/files/nisonugu.pdfIn PDF document text
    • https://tenderdiary.com/ckfinder/userfiles/files/43175320027.pdfIn PDF document text
    • https://rentcar888.com/uploads/files/202109110213204423.pdfIn PDF document text
    • https://12shio3.com/contents/files/39600935533.pdfIn PDF document text
    • http://www.siposferenc.hu/html/foruposatoxo.pdfIn PDF document text
    • http://mgtofubbq.com/uploads/files/65659274935.pdfIn PDF document text
    • http://poney-club-romilly-aigre28.fr/userfiles/file/xoditogigidupesikiger.pdfIn PDF document text
    • http://lsphc.com/userfiles/file///xuwusugegamojopuvan.pdfIn PDF document text
    • http://manchetenewsms.com.br/ckfinder/userfiles/files/31699412759.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_off0000cb1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB1F 10048 bytes
SHA-256: c66157980d24f09e743582064a39233daf97f99da270c5cf757228218603e03d
font_01_sfnt_off0000e17e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE17E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f990.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF990 17572 bytes
SHA-256: 9b62f9d21b53edb509dcb2109ce5f6f282daef9484a11577a90de643f629e36f

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