Malicious PDF — malware analysis report

Static analysis result for SHA-256 dffa51f34c251710…

MALICIOUS

PDF

72.5 KB Created: 2021-03-21 10:59:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 832cd5be31af3da186c1a00601d223a1 SHA-1: cc7716abc9eda7e9a6ff7e053e8aba07ed79e0a1 SHA-256: dffa51f34c251710c08e96cd90dc571ac12f0c13b3752f46ca6d03b0c6c696db
134 Risk Score

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. The file embeds a large number of external links characteristic of an SEO link farm and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://druttle.ru/wix?keyword=multiple+choice+answer+sheet+pdf PDF link annotation
    • http://dhl-order.info/6847531294h7nmv.pdfIn PDF document text
    • http://qrettalq.online/deductive_reasoning_worksheet_with_answer_keyzkzoy.pdfIn PDF document text
    • http://timelessdecorum.com/hamburger_menu_xamarin_forms_samplea3lx6.pdfIn PDF document text
    • http://pitowiragomiwa.22web.org/sublime_text_3_c_code_formatter.pdfIn PDF document text
    • http://world-wild-shop.com/lagu_cinta_luar_biasa_planetlagui1hxr.pdfIn PDF document text
    • http://nibajafij.medianewsonline.com/business_english_vocabulary_builder.pdfIn PDF document text
    • http://useplafond.xyz/pg_diploma_courses_in_business_analytics_in_canadakcykv.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/liwara/words_that_appeal_to_the_readers_five_senses.pdfIn PDF document text
    • https://s3.amazonaws.com/zolerazowubow/the_bureau_of_magical_things_free.pdfIn PDF document text
    • http://jebimotanuz.rf.gd/57074014247.pdfIn PDF document text
    • https://s3.amazonaws.com/sutawowirosuvuv/gilufujudanis.pdfIn PDF document text
    • http://wifofevowogak.onlinewebshop.net/53210306985.pdfIn PDF document text
    • https://fa202315-5cd5-4006-9a99-7c5d4406650e.filesusr.com/ugd/61804c_0b7871100c7b475fbc9a5d0214d2cb62.pdf?index=trueIn PDF document text
    • https://16e729f2-8c5c-4787-b670-14aeba6c5e03.filesusr.com/ugd/ac55e2_291176c046a3485c92c2f35a60954ae7.pdf?index=trueIn PDF document text
    • https://3c199e1c-ff83-4553-a351-db1e9419129c.filesusr.com/ugd/424a74_2b5c2916c80545d3b8848963c1408aad.pdf?index=trueIn 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_off0000dcb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCB7 5340 bytes
SHA-256: 2414012586ffd4760a4376527ee8ceb94194c5eb45de62c12fb5a742cae9a64b
font_01_sfnt_off0000eef7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEF7 11220 bytes
SHA-256: 1e017045583ca96bb299f8020292e070a8821dd52442f77c5c1cb6097b6a6bef

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