Malicious PDF — malware analysis report

Static analysis result for SHA-256 77889a3e6ba86092…

MALICIOUS

PDF

78.5 KB Created: 2021-05-25 07:15:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 53078cb4aade8ba3aa46bbbe1eb5b469 SHA-1: c302a1b3945ee6282c0eee4c1b254f4e170a3331 SHA-256: 77889a3e6ba860927b9a30a965a14d5a5bf995abbc7e3c7fc0e302602de9aa46
164 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses an invoice-themed lure. 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 0.9991

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 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.
  • 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://soxebez.ru/strik?utm_term=supplier+statement+reconciliation+template+excel PDF link annotation
    • https://zatazonikafude.weebly.com/uploads/1/3/4/3/134340422/7abe2e50.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413846/normal_604ec6b6c5984.pdfIn PDF document text
    • https://namosupegu.weebly.com/uploads/1/3/4/3/134313644/7902082.pdfIn PDF document text
    • https://kidamevu.weebly.com/uploads/1/3/1/4/131437276/8113995.pdfIn PDF document text
    • https://kiluzamomumu.weebly.com/uploads/1/3/5/3/135344913/ee6a1a01cc2ca9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376086/normal_60186b73bd0dd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495244/normal_5fd61b9bbbf35.pdfIn PDF document text
    • https://xirunokud.weebly.com/uploads/1/3/4/4/134467368/cea02a4f3965.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/xomudufe/lista_de_verbos_regulares_en_ingles_presente_pasado_y_participio.pdfIn PDF document text
    • https://s3.amazonaws.com/juwofuxufijup/the_hardened_heart_ffxiv_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/86b4ae17-4f98-414c-9cc2-d9ddb59b36d6/a_pair_of_tickets_summary_sparknotes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3561fdee-62cb-461e-be91-ce4dddb72dc3/lubadiramejisiwamenusa.pdfIn PDF document text
    • https://s3.amazonaws.com/jiwisi/kitugakozenuzujijok.pdfIn PDF document text
    • https://s3.amazonaws.com/leributafa/amyloidosis_nccn_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/sevoga/lalon_band_all_mp3_song.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e8f61374-18b6-4f9c-b6bb-943d7d3b05d4/graphic_designer_cv_format.pdfIn PDF document text
    • https://s3.amazonaws.com/tobito/adopt_a_pet_free_day.pdfIn PDF document text
    • https://s3.amazonaws.com/pazatuv/network_capture_android_studio.pdfIn PDF document text
    • https://s3.amazonaws.com/feseni/52570117689.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c6398a0-1f25-41eb-a8d0-0c5826cd7456/national_theatre_live_whos_afraid_of_virginia_woolf_watch_online.pdfIn PDF document text
    • https://s3.amazonaws.com/nufidibodudulad/the_barbell_prescription_strength_training_for_life_after_40_download.pdfIn PDF document text
    • https://s3.amazonaws.com/panalipolifod/countable_and_uncountable_nouns_list_food.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1fc940cd-215b-482b-a788-257e3195f50a/gelosedatolakuvolabotazag.pdfIn PDF document text
    • https://s3.amazonaws.com/tibitexil/87876981422.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_off0000f4a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4A4 5252 bytes
SHA-256: d0088eec9fbf1f528f87e57c29696a5d26dd2bda660c6e02110b64b685b6b817
font_01_sfnt_off00010668.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10668 10980 bytes
SHA-256: ca84ff68611f46e8420dbec140ccc86420784233d6bd1d75c5292bb779eef931

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