Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7a4c01b2e317e56…

MALICIOUS

PDF

73.2 KB Created: 2021-02-28 19:26:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: b1ebd830c2c1b5fd0857d2b03f049b21 SHA-1: b696c7279253b2e5fc51f7201ce48f6a38f6c5f4 SHA-256: d7a4c01b2e317e5698f9bf341bfed575b94e1d07422d321e330227539981a032
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with one specifically pointing to a 'free printable january 2020 calendar pdf' lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for link farms, suggesting a malicious intent to redirect users. ClamAV detection as 'Pdf.Phishing.Trojan' further supports the malicious classification. No scripts were extracted, but the presence of external URIs and the phishing lure strongly suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • 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://druttle.ru/wix?keyword=free+printable+january+2020+calendar+pdf PDF link annotation
    • http://jofifuneku.medianewsonline.com/asus_rt-ac66u_factory_reset_not_working.pdfIn PDF document text
    • http://mobufuwiwid.medianewsonline.com/josaxupefofuxafobufog.pdfIn PDF document text
    • http://parazepurafeza.medianewsonline.com/63349280222.pdfIn PDF document text
    • http://manuximaxemeje.scienceontheweb.net/boviguguvovuzugi.pdfIn PDF document text
    • http://dazenad.iblogger.org/avg_tuneup_2016_free.pdfIn PDF document text
    • http://vomimaforotagi.mywebcommunity.org/48370066919.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gimudujukuweg.rf.gd/47646919892.pdfIn PDF document text
    • http://dojukagufeni.epizy.com/47953207937.pdfIn PDF document text
    • http://zorijefugixor.atwebpages.com/kekojedatelew.pdfIn PDF document text
    • https://s3.amazonaws.com/debiwelof/m_c_d_ki_full_form.pdfIn PDF document text
    • https://s3.amazonaws.com/tuxexi/banda_singh_bahadur_punjabi_movie.pdfIn PDF document text
    • http://bejopobu.epizy.com/bright_line_eating_book.pdfIn PDF document text
    • http://dususawikupap.epizy.com/what_does_husna_mean.pdfIn PDF document text
    • http://zovogimobidel.rf.gd/88851799530.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e300.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE300 5520 bytes
SHA-256: 56b286e5db38a65e193f1bee3ba4fece3912d94c9eb2be501589b8ab3b54229f
font_01_sfnt_off0000f5df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5DF 10032 bytes
SHA-256: 594de04987d421aadbee463d37519e5d69ef74b4769bf91d6cf737b866c89b2c