Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f96b44424491700…

MALICIOUS

PDF

85.5 KB Created: 2021-05-22 03:41:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0d5187b19f6221a62874ca9d1725aa4f SHA-1: cd73177617995fd902c5f5b9883880a72d532d67 SHA-256: 4f96b4442449170061ccc8f46db91549b00dfe627fa33996fe32c19dfe812658
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, a technique commonly used in SEO poisoning to drive traffic to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The embedded URLs and the PDF_SEO_LINK_FARM heuristic confirm the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://manesufepal.weebly.com/uploads/1/3/1/3/131381078/fibugog-kapakisujolid-nukolejef.pdf
    • https://static.s123-cdn-static.com/uploads/4377933/normal_5ffb9ec578973.pdf
    • https://famatogovux.weebly.com/uploads/1/3/4/6/134614416/litenuwadojot.pdf
    • https://cdn-cms.f-static.net/uploads/4407327/normal_6025c96023b5a.pdf
    • https://vuwuzujos.weebly.com/uploads/1/3/2/7/132712237/f9d63907b19d5.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://feedproxy.google.com/~r/wb/ENAH/~3/bQ3nTxENlgE/wb?keyword=gramos%20a%20tazas%20avena
    • https://s3.amazonaws.com/bikikanafopavu/94859970117.pdf
    • https://uploads.strikinglycdn.com/files/d41f959e-a17b-4388-adb0-657f7e9200ee/wosuvezat.pdf
    • https://s3.amazonaws.com/zarusegibitumet/lopojobe.pdf
    • https://s3.amazonaws.com/jotizifime/pefawakorez.pdf
    • https://s3.amazonaws.com/towutoginadivu/what_are_miracles_according_to_the_bible.pdf
    • https://s3.amazonaws.com/jenagubadopi/letter_of_recommendation_for_payroll_administrator.pdf
    • https://s3.amazonaws.com/bulolimepol/30112785960.pdf
    • https://uploads.strikinglycdn.com/files/364a40fa-ba34-4e8d-a0da-f30bb6ab5f16/can_you_use_a_vaporizer_with_just_water.pdf
    • https://s3.amazonaws.com/vavale/monthly_calendar_template_printable_2018.pdf
    • https://s3.amazonaws.com/lazolu/how_to_get_a_5_on_ap_calc.pdf
    • https://s3.amazonaws.com/jikopot/persuasive_techniques_examples.pdf
    • https://s3.amazonaws.com/lekizopiloref/historicism_theory.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed52.bin
f0c591343b1160cd3ea346b28c7e3d07d54ccddfa8ce72968ff3509bc6fe96c3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED52 4680 bytes
font_01_sfnt_off0000fd23.bin
555f457248b508665f7e09b726734eb08388c93bc2f8bfa9f55fec99725572ea		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD23 11896 bytes
font_02_sfnt_off0001240c.bin
c988415812f594187b0a0ed75dc52802e798e1695b49bd300f8412a65040a449		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1240C 16204 bytes
font_03_sfnt_off0001393b.bin
7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1393B 4324 bytes

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