Malicious PDF — malware analysis report

Static analysis result for SHA-256 fab72b22a04d5917…

MALICIOUS

PDF

69.1 KB Created: 2021-09-24 23:57:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: fa72df42907c4dfa3697ab6af3b58dc1 SHA-1: c86f90a247f11492245df018a60cc16cb46b42e9 SHA-256: fab72b22a04d5917712ace2c88dc2f041cc34916a22a37c26bfe696f661f476d
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with several heuristics pointing to a link farm hosted on disposable domains and IP addresses, suggesting a phishing or malware distribution scheme. The document body is heavily obfuscated and unreadable, providing no further context on the specific 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://philabc.ru/uplcv?utm_term=chal+mera+putt+film+part+2 PDF link annotation
    • http://140.121.125.49/ckfinder/userfiles/files/20210916_025312.pdfPDF link annotation
    • https://thietkeweblongan.com/upload/files/80200772712.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614e2bdba57a1---xefalogitemezomanuxuzija.pdfIn PDF document text
    • http://underbutter.cz/download/foto/kabitebetasin.pdfIn PDF document text
    • http://szao-spb.ru/images/news/file/69637015228.pdfIn PDF document text
    • http://ain.proximeo.com/ckfinder/userfiles/files/wegisapugexanor.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144a77d2d5ac---23312540866.pdfIn PDF document text
    • http://aptekarynek.pl/zdjecia/fck/file/valifexekem.pdfIn PDF document text
    • http://shethof.ch/cgi-bin/dynamisch/file/82839647657.pdfIn PDF document text
    • http://taiwangallant.com/uploads/files/202109172354318679.pdfIn PDF document text
    • http://xedaptap.net/userfiles/file/61070842348.pdfIn PDF document text
    • https://espritgt.com/userfiles/file/rakorigaxijarez.pdfIn PDF document text
    • https://ph2020.org/ckfinder/userfiles/files/jokukikap.pdfIn PDF document text
    • http://cnmrobotics.com/files/files/33423595582.pdfIn PDF document text
    • http://izumrud38.com/ckfinder/userfiles/files/66196143307.pdfIn PDF document text
    • http://guidesdugrandlarge.fr/images/import/file/daduwunizovinabitajujuw.pdfIn PDF document text
    • http://aptekainternetowa.net/_mdm_apteki/file/fopajirebuxutuvosufawo.pdfIn PDF document text
    • https://hargagila.com/uploads/image/files/gitatafizepe.pdfIn PDF document text
    • http://aotwresort.org/ckfinder/userfiles/files/81677843824.pdfIn PDF document text
    • http://spellenindex.nl/images/uploads/79717424422.pdfIn PDF document text
    • http://wsospice.org/uploads/userfiles/file/file/xosomujowilegujomojepovol.pdfIn PDF document text
    • http://zap-interactive.com/uploads/files/xafotirezupisigojifenukiz.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_off0000adb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADB5 16324 bytes
SHA-256: 8f03f6d01491c24914fbdde765b9503e0b356c0cc194a7d59f8c7923c3d93539
font_01_sfnt_off0000d73b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD73B 10480 bytes
SHA-256: e8d6d052e96fbe4f80a84faf0a3cba73910c0eb104bae4309e0e82c420533674
font_02_sfnt_off0000ef0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF0B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1