Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b28d8160d013778…

MALICIOUS

PDF

75.9 KB Created: 2021-04-03 02:33:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: f2ed7df3cec15dc5b96f4adc2f0e2ce7 SHA-1: 9ed3980896455c36006b683476053a671585890c SHA-256: 8b28d8160d0137787897c076b843fb0e09eded1acac186cebf5bbb5fdb239acf
126 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://dugedepap.ru/wix?keyword=tv+guide+hickory+nc PDF link annotation
    • http://kufafukedexepix.mygamesonline.org/13037813349.pdfIn PDF document text
    • http://trysol.xyz/revolution_20_20_chetan_bhagat_book_reviewu655j.pdfIn PDF document text
    • http://jebebixazonutug.mypressonline.com/31087604285.pdfIn PDF document text
    • http://mopexaxurip.getenjoyment.net/caruso_pavarotti.pdfIn PDF document text
    • http://dosijefa.mypressonline.com/68860513507.pdfIn PDF document text
    • http://segaruzobuguses.scienceontheweb.net/after_book_3.pdfIn PDF document text
    • http://wellwork.site/ocd_book88i6v.pdfIn PDF document text
    • http://lojapidabud.mypressonline.com/29972664477.pdfIn PDF document text
    • http://soldonlittleton.com/jixukuwofepabofwrbs7.pdfIn PDF document text
    • http://sezejawi.mypressonline.com/wadaji.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/gapivegek/56545988009.pdfIn PDF document text
    • http://lukafimagog.atwebpages.com/wuvap.pdfIn PDF document text
    • https://s3.amazonaws.com/tokatefozude/chapter_15_lymphatic_system_and_immunity_answers.pdfIn PDF document text
    • http://pipotaxi.rf.gd/vujibaw.pdfIn PDF document text
    • http://zedakukabizo.epizy.com/komazopegaxiralif.pdfIn PDF document text
    • https://s3.amazonaws.com/zufojadibi/free_product_catalogue_design_templates.pdfIn PDF document text
    • https://s3.amazonaws.com/jonora/jarijevodizafobigugogiz.pdfIn PDF document text
    • http://mojigoka.atwebpages.com/ammonia_toxicity_in_fish.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_off0000ebc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBC5 4956 bytes
SHA-256: 7dd99764a15dce0fb10aaf49f96f4b3c79a55cae8b7d305e4fc2c4e2baa332ff
font_01_sfnt_off0000fcb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCB0 11140 bytes
SHA-256: 01f29b00b74f87d06b02e40e0debf516fb8f36ee7f13373a5234d2d522c57922