Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b15971da22cf3a7…

MALICIOUS

PDF

78.3 KB Created: 2021-02-26 11:44:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 1805d7ad672ff7d744d332e126cdf653 SHA-1: bd111dd4b9323ea7637ee49cdfb71a469f575e83 SHA-256: 8b15971da22cf3a792a9ed0fc78ea4590a6a2d948f880d4b3c1141f7dd28626b
156 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 of which are to other PDF files, suggesting a link farm or SEO manipulation tactic. The primary URL, 'https://nipisod.ru/wix?keyword=zelda+parallel+worlds+remodel', appears to be a lure. ClamAV detected this as 'Pdf.Phishing.Trojan', and ML classification strongly indicated maliciousness. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a phishing or malicious redirection attempt.

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 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.
  • 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://nipisod.ru/wix?keyword=zelda+parallel+worlds+remodel PDF link annotation
    • https://cdn.sqhk.co/jikowuzu/rhhjh8U/john_travolta_bubble_boy_gif.pdfIn PDF document text
    • https://cdn.sqhk.co/siboxowimu/hVjegiL/xosonularaxobipaw.pdfIn PDF document text
    • http://demask.fun/upci_ministers_license_requirementsdimlh.pdfIn PDF document text
    • https://pamuguvijokogag.weebly.com/uploads/1/3/4/8/134883264/9796300.pdfIn PDF document text
    • https://xunasumip.weebly.com/uploads/1/3/2/6/132696393/risojomige.pdfIn PDF document text
    • https://vunadonugo.weebly.com/uploads/1/3/1/0/131070983/5793277.pdfIn PDF document text
    • https://cdn.sqhk.co/reruzemafow/HFhcsgg/after_burner_climax_arcade_pc.pdfIn PDF document text
    • https://cdn.sqhk.co/mexovaru/iiAqheA/xogokadilozikokutim.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://s3.amazonaws.com/xenavuxa/48154852076.pdfIn PDF document text
    • https://s3.amazonaws.com/geraromu/vipominekimekibemugok.pdfIn PDF document text
    • https://s3.amazonaws.com/gixirojozogufux/windows_10_enterprise_1803_esd.pdfIn PDF document text
    • https://s3.amazonaws.com/pusori/inferences_worksheet_4_answer_key.pdfIn PDF document text
    • https://s3.amazonaws.com/woxewiwupir/css_grid_template_rows_auto.pdfIn PDF document text
    • https://s3.amazonaws.com/lizuseguwix/classification_des_actinomycetes.pdfIn PDF document text
    • https://s3.amazonaws.com/jepavilutabilel/ganonazelesakerikopaji.pdfIn PDF document text
    • https://s3.amazonaws.com/mixanaz/animated_movie_wallpapers_hd_free.pdfIn PDF document text
    • https://s3.amazonaws.com/vipuxafol/jasamefipujowumivofuf.pdfIn PDF document text
    • https://s3.amazonaws.com/jiwotarotavuz/get_your_guide_berlin_office_address.pdfIn PDF document text
    • https://s3.amazonaws.com/gowupuzokowuxes/nakofaxetexexadaniketak.pdfIn PDF document text
    • https://s3.amazonaws.com/jasadavebaga/56534302453.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_off0000eabf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEABF 4708 bytes
SHA-256: a774fd8b83a9a1e17b4a337a0f7e8b960b0c2b548463aed66ee841b3dc403020
font_01_sfnt_off0000faca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFACA 10184 bytes
SHA-256: 1facfc0957aa2771a41a5c5ffd0ea1a93bfd3e31c6998e04e635257c2e0c1e44
font_02_sfnt_off00011db1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DB1 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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