Malicious PDF — malware analysis report

Static analysis result for SHA-256 a213ead0bb7b0a6f…

MALICIOUS

PDF

76.0 KB Created: 2021-04-01 00:34:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 854b5849f5205e19b82fb3ccc45e5daf SHA-1: 05a7421d74c9471811087093dca9db10eaa8627f SHA-256: a213ead0bb7b0a6f50f72c83f28f2b7e7ff72bd8431c756f2225e1f5f303a93e
186 Risk Score

Malware Insights

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

The PDF document contains a mass of external links, identified as a link farm, and is flagged by ML and ClamAV as a phishing trojan. The embedded URLs suggest an attempt to lure users to malicious content or phishing sites. No scripts were extracted, but the overall structure and heuristic firings strongly indicate a malicious intent to deceive or phish users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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.
  • 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/award?keyword=autobiography+outline+template+pdf PDF link annotation
    • http://rululidevasuv.22web.org/area_of_trapezium_worksheet_class_8.pdfIn PDF document text
    • https://litokotivugobud.weebly.com/uploads/1/3/2/6/132695550/wotiramo.pdfIn PDF document text
    • https://jenazikefu.weebly.com/uploads/1/3/4/0/134017187/2810627.pdfIn PDF document text
    • http://rujitexoxobag.mypressonline.com/apush_period_1_multiple_choice_questions.pdfIn PDF document text
    • https://salewuso.weebly.com/uploads/1/3/1/3/131379029/87ef15a44287.pdfIn PDF document text
    • http://mowefopovog.mywebcommunity.org/78924162700.pdfIn PDF document text
    • http://medebupima.sportsontheweb.net/india_latest_news_today_in_hindi.pdfIn PDF document text
    • https://wokawopirajer.weebly.com/uploads/1/3/3/9/133999547/81a65f7858.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://a9750898-a066-404d-a796-54a2f5ad13bb.filesusr.com/ugd/60231a_fed25014bfdd45d18f38c76725b51a18.pdf?index=trueIn PDF document text
    • https://550dfcec-0280-4316-a0d5-68b74a7a20b9.filesusr.com/ugd/f59309_ed00e4753e5f4182a024fe2a3655e7ed.pdf?index=trueIn PDF document text
    • http://wumoxafu.epizy.com/62275436043.pdfIn PDF document text
    • http://fetakeseravisu.epizy.com/bukafu.pdfIn PDF document text
    • http://pawesew.epizy.com/bise_sargodha_1st_year_date_sheet_2019.pdfIn PDF document text
    • https://33c7e2ec-32fc-4676-a642-9d95a4379e01.filesusr.com/ugd/622218_7d558541312b47c0afb3ff9710f43dd2.pdf?index=trueIn PDF document text
    • http://gudagugagazof.rf.gd/miserezomas.pdfIn PDF document text
    • https://fac7854b-22c3-40b9-bef9-ee94a55a010d.filesusr.com/ugd/fba82c_4106d25df1924739ab9e390c48eb8964.pdf?index=trueIn PDF document text
    • http://lugopupi.rf.gd/womirifebakiteripam.pdfIn PDF document text
    • http://lipabarud.atwebpages.com/fafejesudegebisozumoxixos.pdfIn PDF document text
    • https://2ea9429b-0332-4ee6-bb75-ab9535b56c99.filesusr.com/ugd/e2f7e1_a1090881f0d64cef8e8c8b01844d3b21.pdf?index=trueIn PDF document text
    • https://156bb51f-0b62-477f-88ca-8620af00812b.filesusr.com/ugd/e3ff21_4f51cd2051b844579097685a24eec4c0.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_off0000ec76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC76 5508 bytes
SHA-256: 63589a549e25c4fc8b9a43b46260ebfde38877d4149208130a33b02abd139506
font_01_sfnt_off0000ff11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF11 10400 bytes
SHA-256: a1d212614a410dd8eaa2f7f77221028e1765ab547a0f4ac1fc41b4be6226ad54

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