Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea9d3c990cb5a9b4…

MALICIOUS

PDF

73.8 KB Created: 2021-03-15 04:26:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 4f511d25ae2fe56b016ac111eb02503d SHA-1: b8b3451d8b78af9072274fdfb679e596aa3d6808 SHA-256: ea9d3c990cb5a9b4afd0169e64d3d565c23516bf2383ce300b6a48937c3f08fe
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 0.9997

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://bologen.ru/123?utm_term=label+template+word+18+per+sheet PDF link annotation
    • https://wokopapun.weebly.com/uploads/1/3/5/3/135388848/nosoxinaku-gusopofolifis.pdfIn PDF document text
    • http://lebojabufi.medianewsonline.com/22319444851.pdfIn PDF document text
    • http://sifisomatexow.sportsontheweb.net/39387552187.pdfIn PDF document text
    • https://kadamoxezegawuf.weebly.com/uploads/1/3/4/3/134347408/5921020.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/julexekubaj/a_state_of_trance_900.pdfIn PDF document text
    • https://s3.amazonaws.com/zumomasugipeno/mamudifereko.pdfIn PDF document text
    • https://s3.amazonaws.com/gidibesuxi/54719586363.pdfIn PDF document text
    • https://493f174a-a540-412c-bacb-e5b7b26cbfcf.filesusr.com/ugd/95bb70_f15be956acca4085b3c69cdb208af683.pdf?index=trueIn PDF document text
    • https://40e214c1-1950-44e8-a195-e2c6eeb23253.filesusr.com/ugd/a517f4_5537fec3b8d04ec780a53854861cdda5.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/fad7373a-d29e-42a6-bedf-b81563d128c6/what_to_the_slave_is_the_4th_of_july_full_speech.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c5687d75-223d-4b8c-83fe-28fd94b8b08a/real_analysis_book_for_csir_net.pdfIn PDF document text
    • https://s3.amazonaws.com/ganubatebedoxez/rune_factory_4_dating_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/vatakefojunib/nice_guidelines_for_blood_transfusion.pdfIn PDF document text
    • https://s3.amazonaws.com/voxipanovigepiv/65505660265.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/71773b0b-8276-4e8a-9a34-920ba4ad6f5b/befakafisoxigo.pdfIn PDF document text
    • https://601bead5-a720-4f65-98db-62fe2a42cb91.filesusr.com/ugd/0e52b4_fc8c8778eb5843429c9f7e26e0baf8ca.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lopadivupudexa/motusiwaxajaxivosik.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fcf0817b-97d1-4492-b476-6e1c17ad6a09/is_it_dangerous_if_your_pet_dog_bites_you.pdfIn PDF document text
    • https://ad843f61-c544-48d7-8cfb-3c048b9edb46.filesusr.com/ugd/0dd9ed_e3113640a97746c1b941b031cbe4d196.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d8734a7f-8340-4854-b2ae-31a783abf64f/how_to_get_rid_of_santivirus_on_windows_10.pdfIn PDF document text
    • https://s3.amazonaws.com/susonanezaj/entrepreneurship_development_textbook.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_off0000e23f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE23F 5620 bytes
SHA-256: a43e19d522694bd6bb6601c5fcbf0a8d85565eb2b91cf5519e027e8e5dabea12
font_01_sfnt_off0000f53d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF53D 10784 bytes
SHA-256: 161a632e4c62a4a2a2abbab3b6f61b203ba7ed5c38a2d3066d6cbcd317aa960b

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