Malicious PDF — malware analysis report

Static analysis result for SHA-256 f63cbea7b58da0f3…

MALICIOUS

PDF

68.1 KB Created: 2021-03-03 11:43:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 56a2ff7a2f8f1381862167598557ed19 SHA-1: 78b81ca9ca8193b80cc3f5511097cc0eac4a9a2b SHA-256: f63cbea7b58da0f3b7ea927e77abe564771955135384e3aa08b39d80a83ee3e7
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to PDF files, suggesting a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly indicate maliciousness, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external URIs are indicative of malicious intent, potentially leveraging embedded JavaScript for further actions.

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://fokemale.ru/award?keyword=what+is+visual+analysis+in+reverse+engineering PDF link annotation
    • https://diwolusetu.weebly.com/uploads/1/3/5/2/135299278/zawuzolanedef.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413235/normal_5fe311d82aecd.pdfIn PDF document text
    • https://buporinedo.weebly.com/uploads/1/3/4/0/134041533/89b73.pdfIn PDF document text
    • https://cdn.sqhk.co/gixixutiji/jcicRjj/dikuwaxiguxewe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374024/normal_60399e36b980f.pdfIn PDF document text
    • https://gulurevipad.weebly.com/uploads/1/3/5/3/135349864/koteduj-xesadavuxifot-tujuzizefo-juwiwoxo.pdfIn PDF document text
    • https://gaturavokig.weebly.com/uploads/1/3/4/3/134317265/rabupowekefo_liguvukipixeto_faxaziravotot_wazutupopix.pdfIn PDF document text
    • https://cdn.sqhk.co/lilokimoz/iTjcjeL/fewasisemeforiruwigax.pdfIn PDF document text
    • https://povazolanatul.weebly.com/uploads/1/3/0/7/130740072/volovunu-xukibimeli-xevozoris-wofevepatirexa.pdfIn PDF document text
    • https://vilujelirajoki.weebly.com/uploads/1/3/4/3/134378771/4862278.pdfIn PDF document text
    • https://cdn.sqhk.co/sodelaranu/c3icvhc/brave_frontier_heroes_event.pdfIn PDF document text
    • https://cdn.sqhk.co/dolubivo/6rgisAR/cardboard_playhouse_diy.pdfIn PDF document text
    • https://cdn.sqhk.co/filodomazora/uiaghe6/best_gps_navigation_map_app.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/lurutopobi/kozarenonolebepelapigenez.pdfIn PDF document text
    • http://zikoliduxa.atwebpages.com/how_to_change_a_lightbulb_in_a_ge_microwave.pdfIn PDF document text
    • https://s3.amazonaws.com/tevigotu/whatsapp_free_by_play_store.pdfIn PDF document text
    • https://s3.amazonaws.com/nosepevozux/nivizufobotazutelikifa.pdfIn PDF document text
    • https://s3.amazonaws.com/megulu/giwavezobumu.pdfIn PDF document text
    • https://s3.amazonaws.com/xazarujokemus/70669146783.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_off0000d0f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0F0 5124 bytes
SHA-256: 6967b1e9b77367dbce5b1fe2c1ef6d52d56e932d788364d79dc07ac5eda534d3
font_01_sfnt_off0000e26c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE26C 9572 bytes
SHA-256: 908e191d92c934cba952facaaf8c439722f9fc8ea0604a596660a3224ada78d6

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