Malicious PDF — malware analysis report

Static analysis result for SHA-256 19536ff490e59056…

MALICIOUS

PDF

77.3 KB Created: 2021-02-20 13:55:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: f5ed3829e3af07e18229de08235d9a5c SHA-1: cda09895b1ae7e66fd612bea523c683c112cc722 SHA-256: 19536ff490e5905686fdae9637afd1bb600e95fc484a686af26498a9530ef2e1
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with a critical heuristic firing for a link to known malicious redirector infrastructure. The ML classifier also strongly indicated maliciousness. The document body, though heavily garbled, contains text related to the embedded URLs, suggesting a lure. The presence of numerous links on disposable hosting further supports a malicious intent, likely to phish for credentials or distribute further malware.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/wix?keyword=sprint+spectrum+lp+phone+lookup In PDF document text
    • https://tekudijasefemo.weebly.com/uploads/1/3/2/7/132740256/waxane_vokuni.pdfIn PDF document text
    • http://bossyonlinex.com/wixabelemorinorikelowvuv4h.pdfIn PDF document text
    • http://gelchlen.fun/motu_patlu_cartoon_movie_vs_mobivj5qm.pdfIn PDF document text
    • http://wumokejo.iblogger.org/singular_and_plural_pronouns_worksheet_grade_2.pdfIn PDF document text
    • http://trells.space/scorecloud_studio_freebi1fu.pdfIn PDF document text
    • https://radamokugek.weebly.com/uploads/1/3/2/6/132696621/femejagomokolep_nutisotegitodig_nololada.pdfIn PDF document text
    • http://lnstagramverifycentre.com/pevubototusaxuvat7rufm.pdfIn PDF document text
    • http://organic100.fun/mebowatevexuradeba0l0d2.pdfIn PDF document text
    • http://lnstagramverifiedsbadgeform.com/brother_mfc-7840w_printer_wireless_setuplw2g7.pdfIn PDF document text
    • https://gujibukogise.weebly.com/uploads/1/3/1/3/131380045/424140.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/dinigugaxej/madcap_flare_template.pdfIn PDF document text
    • https://s3.amazonaws.com/nefomojuwet/beginning_reading_worksheets.pdfIn PDF document text
    • http://fujebudavitasoz.epizy.com/biriyani_movie_isaimini.pdfIn PDF document text
    • https://s3.amazonaws.com/rilexazejuzovep/29426011359.pdfIn PDF document text
    • http://rejosunugewojif.epizy.com/degedaduvitoselosaj.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_off0000eb9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB9D 5132 bytes
SHA-256: c4c3b5ff87041575c54ee80e362ad08573132a83a5d3d0ec7d644f8316576349
font_01_sfnt_off0000fce8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCE8 13620 bytes
SHA-256: 87c05a1c4c784d9a56b1271cb1803462d5071c24a3e6dde0ac0acb3d486c29c2

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