Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d8f7a3ce297819e…

MALICIOUS

PDF

79.1 KB Created: 2021-03-23 01:07:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 23bfe343261071f0bf3162ba43011e88 SHA-1: 89fe92a58a7388d8ce0850aa0975b05cee3898be SHA-256: 4d8f7a3ce297819e200a61f8f5a350bf06a4ad9fab1c545807b52f000806999d
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded URLs and the heuristic firings point towards a phishing or malicious redirection scheme, likely using a PDF as a lure to drive traffic to these external sites.

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 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://golowaki.ru/123?utm_term=ecosystem+mcq+question+and+answer+pdf PDF link annotation
    • http://bidizujimon.getenjoyment.net/83288985055.pdfIn PDF document text
    • http://dokukuke.mypressonline.com/plan_diario_de_alimentacin_para_diabticos.pdfIn PDF document text
    • https://zeginuvo.weebly.com/uploads/1/3/0/7/130775519/d975170c56ab1.pdfIn PDF document text
    • https://guzepebizosi.weebly.com/uploads/1/3/4/8/134880367/8661937.pdfIn PDF document text
    • https://tepupareta.weebly.com/uploads/1/3/0/8/130814680/4928f.pdfIn PDF document text
    • https://fuvipizewovotat.weebly.com/uploads/1/3/1/0/131069886/8cd81dfd204.pdfIn PDF document text
    • https://boxesagako.weebly.com/uploads/1/3/4/5/134589877/5243538.pdfIn PDF document text
    • http://tamogulaganero.scienceontheweb.net/journal_ledger_cash_book_mcqs.pdfIn PDF document text
    • http://irbestate.ru/69965298657xht8c.pdfIn PDF document text
    • http://minesaxofunawi.getenjoyment.net/zikinamapagakosafasoweta.pdfIn PDF document text
    • https://lalurarejodu.weebly.com/uploads/1/3/5/2/135297054/bimuroxixebelug_jidogisiki_sofor.pdfIn PDF document text
    • http://hocostyle.ru/884292258491h2wu.pdfIn PDF document text
    • https://vojimefijizudi.weebly.com/uploads/1/3/4/3/134310580/86e9210bef3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://fa53e508-d88d-41cb-897c-7a5b6f1bfcc3.filesusr.com/ugd/361045_c32316ce6b884c5bb840aead101cdcad.pdf?index=trueIn PDF document text
    • https://dc6b22d1-fd3c-476a-b8f1-b0505981f591.filesusr.com/ugd/ab5adf_8d96fb678a474cb7b39781d556f6cff9.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/novipaliwid/38638091478.pdfIn PDF document text
    • https://s3.amazonaws.com/fokapikow/can_i_pay_my_ticket_online_in_california.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e992.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE992 5428 bytes
SHA-256: 419545bef9653c03e97eac7b77121e18c2e7c3c7ea9b57b29374f5a222a7a397
font_01_sfnt_off0000fbfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBFD 10868 bytes
SHA-256: 1c3cb643c4b277c9f9da628dd130e475b31dae9b78b0bc82b0c22c55515828d3
font_02_sfnt_off000120ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120EF 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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