Malicious PDF — malware analysis report

Static analysis result for SHA-256 0aba0f2da3385c0b…

MALICIOUS

PDF

101.2 KB Created: 2021-03-24 15:40:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: ed1a2471eecd04490868c8b79412609c SHA-1: a49f27ffb91dc1593bdf83a4044e03b18d87590e SHA-256: 0aba0f2da3385c0b856a9e8e359f11eb6f9b8e7924722e700513346a1e61c9cd
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs pointing to potentially malicious domains, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'ML_NYX_PDF_MALICIOUS' heuristics. ClamAV also detected it as 'Pdf.Phishing.Trojan'. The document body, though heavily obfuscated, suggests a lure related to 'modal verbs in english grammar pdf', likely to trick users into visiting the linked sites for phishing or malware download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://kuzutuzo.ru/award?keyword=modal+verbs+in+english+grammar+pdf PDF link annotation
    • https://sefewazugep.weebly.com/uploads/1/3/5/2/135293251/1244229.pdfIn PDF document text
    • http://price-list.moscow/reported_cases_of_leptospirosis_in_dogs_ukhv2mc.pdfIn PDF document text
    • http://jobs-ingenieur.best/70297095229muyn6.pdfIn PDF document text
    • http://atomyimperial.ru/gerevevagamevitngvkx.pdfIn PDF document text
    • https://xuzonikafu.weebly.com/uploads/1/3/5/3/135351414/doserinavakoraruve.pdfIn PDF document text
    • https://vevumugenewasu.weebly.com/uploads/1/3/0/7/130776279/wesusipewefipi_kukosazizar_fafupaf.pdfIn PDF document text
    • https://cdn.sqhk.co/jidulopavoji/fjehdij/blocky_roads_hack_apk.pdfIn PDF document text
    • http://excschool.ru/59226577043cdhe.pdfIn PDF document text
    • http://helplnstagramcontact6088758.com/when_do_you_use_i_am_or_im2n97x.pdfIn PDF document text
    • https://cdn.sqhk.co/lepudijazur/djjigif/fepogunexatim.pdfIn PDF document text
    • http://daravto18.ru/3072072252om67h.pdfIn PDF document text
    • https://wufonujixu.weebly.com/uploads/1/3/4/3/134386315/dovuz.pdfIn PDF document text
    • https://sepiximefajo.weebly.com/uploads/1/3/4/8/134849953/1888394.pdfIn PDF document text
    • http://prognoz-football.club/xanesuretirewezujurumu1xx3q.pdfIn PDF document text
    • https://zurukuwimuso.weebly.com/uploads/1/3/4/3/134325804/werikabo.pdfIn PDF document text
    • https://cdn.sqhk.co/wovenebi/nieicQA/taylor_big_baby_taylor-_e_acoustic-_electric_guitar.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://satikemapobivix.epizy.com/human_genome_project_worksheet.pdfIn PDF document text
    • http://foweroboxufafuv.epizy.com/lanew.pdfIn PDF document text
    • http://kalogoraretupo.epizy.com/wizowi.pdfIn PDF document text
    • http://gazunobopa.epizy.com/gre_math_prep.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_off00014890.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14890 5660 bytes
SHA-256: a9b81f708305a726d7f5e0d044b9e47918681c518d6e2e96eb0819dd33d8326d
font_01_sfnt_off00015bb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15BB0 12924 bytes
SHA-256: 9145afd6d51cd5259c4535d2db69f21600151181774e038300003ad5f31e09b8

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