Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb62652aaf7add53…

MALICIOUS

PDF

77.1 KB Created: 2021-09-23 10:10:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a33f91cc63dfb497b7eb20e09dffd7f6 SHA-1: 89cf55d8b8a44a46ef5e340016ec8c34787a1281 SHA-256: cb62652aaf7add53e81da2cd10614aec370bcdb65476833b48868d4fa804926f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV, indicating malicious intent. It functions as a link farm, containing numerous URLs pointing to other PDF files hosted on various domains. This suggests a multi-stage attack where the initial PDF serves as a lure or a distribution point for further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://thebookonpersonaltransformation.com/FCKeditor/file/72291906240.pdf In PDF document text
    • http://standardamulet.com/files/files/vagatonurak.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/5j4l8m19oobhh4kf1qhalvuoj3/tefegok.pdfIn PDF document text
    • http://decoworld.in/dayafter/uploadimages/newsimages/file/3577889762.pdfIn PDF document text
    • http://vom-ragnaroek.de/uploads/file/nasasobezegafokewenum.pdfIn PDF document text
    • https://myreply.mobi/snappshott/editor//file/jelemazarolofalaguk.pdfIn PDF document text
    • https://securitydm.rs/slicice/file/baxifi.pdfIn PDF document text
    • http://affordableadobe.com/ckfinder/userfiles/files/vegadujamavimikikaweva.pdfIn PDF document text
    • http://bjdfszwy.com/filespath/files/20210904161037.pdfIn PDF document text
    • https://namhunglogistic.vn/site/files/depunugajive.pdfIn PDF document text
    • http://master-br.ru/img/file/75534497291.pdfIn PDF document text
    • http://saddabro.com/userfiles/file/kekunebavameparijalarojel.pdfIn PDF document text
    • http://www.terresdescaraibes.fr/file/japikazileb.pdfIn PDF document text
    • http://demo-jesma.shopcloud.es/ckfinder/userfiles/files/diran.pdfIn PDF document text
    • https://ozora.schaffsen.com/contents/file/zobod.pdfIn PDF document text
    • https://coonvalleycc.com/userfiles/file/buziweduzenop.pdfIn PDF document text
    • http://haustechnik-hagenauer.at/rivirosafibodokogot.pdfIn PDF document text
    • https://at1apigroup3.com/contents/files/difudeletujivewarop.pdfIn PDF document text
    • https://biodez.lt/i/File/85371330046.pdfIn PDF document text
    • http://zeroseistudio.eu/userfiles/files/52917922621.pdfIn PDF document text
    • http://horvathortho.hu/tmp/siwatakuj.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/aeee87ac4ea6a3270a6e708c8c1f6c61/63880914899.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=16+ka+square+rootPDF 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_off0000cc9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC9B 16400 bytes
SHA-256: d0ff6f0cd913c74c8b55c3298428ad005c3b794edc195e279b0dc4bc5da0f796
font_01_sfnt_off0000f730.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF730 10320 bytes
SHA-256: eb0566392dc411c45e6bacf025ffb025844c446cce8213a3ed3996f15876acdb
font_02_sfnt_off00010ebd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EBD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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