Malicious PDF — malware analysis report

Static analysis result for SHA-256 11f84d28aec2c151…

MALICIOUS

PDF

83.9 KB Created: 2021-10-06 18:08:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 48b2ca70b937e58471b7719bd39db272 SHA-1: 6f8623a9d7c5fb7c1caf761be7e1e4bd21ac23d1 SHA-256: 11f84d28aec2c1514cd5de27da811ec958c701dbc65df28b1c21642ee9099e3a
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, and exhibits characteristics of a phishing lure. It contains numerous embedded URLs, many of which point to disposable hosting and appear to be part of a link farm designed to redirect users. The presence of these URLs suggests an attempt to trick users into downloading further malicious content, likely through a phishing or scam pretext.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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
  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://drafthe.ru/uplcv?utm_term=a+time+for+love+bill+evans+pdf PDF link annotation
    • http://mamam.by/upload/File/file/novanefujag.pdfIn PDF document text
    • http://tainanrup.longi.tw/uploadfiles/files/20210928_185041_6744.pdfIn PDF document text
    • http://seoaudytor.pl/userfiles/file/1621547779.pdfIn PDF document text
    • https://baigiangtoanhoc.com/upload/files/guxazesubodugoluwuzizesu.pdfIn PDF document text
    • https://ssmahavidyalaya.org/lion/uploadedfiles/fck/files/file/57790829255.pdfIn PDF document text
    • https://sanmuabandoanhnghiep.org/images/content/files/71324629770.pdfIn PDF document text
    • http://qianlong99.org/ckfinder/userfiles/files/lifaxabuf.pdfIn PDF document text
    • https://clubsecurite.fr/webroot/upload/files/wizefajeteduzone.pdfIn PDF document text
    • https://successalpha.team/upload/files/vutobunubumurulo.pdfIn PDF document text
    • http://hnhappiness.com/d/files/15415153287.pdfIn PDF document text
    • http://elma1.ru/!upload/files/kujewuxiga.pdfIn PDF document text
    • http://dhalahoredeals.com/survey/userfiles/files/fovonezos.pdfIn PDF document text
    • http://tykhchem.com/upload/files/zesatugusu.pdfIn PDF document text
    • http://jungam21.com/upfiles/file/1631881388.pdfIn PDF document text
    • https://successstudio.net/userfiles/file/77531172926.pdfIn PDF document text
    • https://xylemleads.com/userfiles/file/23675841174.pdfIn PDF document text
    • https://giant-nano.com/app/webroot/userfiles/files/847509589.pdfIn PDF document text
    • http://bhk-aindling.de/userfiles/files/13376862567.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1614102263326b---worexenalijibititinetax.pdfIn PDF document text
    • http://jakpaisanestate.com/images/upload/files/29756244958.pdfIn PDF document text
    • http://myjobcareer.net/userfiles/file/2021090615423273499.pdfIn PDF document text
    • http://falegnameriacastiglione.it/userfiles/files/52356416423.pdfIn PDF document text
    • http://kvrhousing.com/uploads/33825615082.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_off0000deb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEB4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f6c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6C6 19476 bytes
SHA-256: db817117d85e39b06652fe0fe559b439ee56eef515cff7fa25d7573a8fda706c
font_02_sfnt_off00012989.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12989 10848 bytes
SHA-256: 456bbf627d2f2ef3bad802c2e05c2c9c61a6b8f15c3aa34b40e7c2b437f223fd

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