Malicious PDF — malware analysis report

Static analysis result for SHA-256 7487329145ff8f53…

MALICIOUS

PDF

73.9 KB Created: 2021-02-23 01:30:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 7acaa08c03e430631f1ed8720c788105 SHA-1: 7169ad2c4fcf1097074ac038ea3241d24a8f68e9 SHA-256: 7487329145ff8f5394e54e0156607836b082977ab6254f6afb7deda06455710a
126 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains an embedded URI pointing to 'seumenha.ru', which is likely part of a phishing or malware distribution scheme. The document body, though heavily obfuscated, appears to be a lure related to technical information, suggesting a social engineering tactic to encourage users to click the malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://seumenha.ru/wb?keyword=lenovo%20ix2-dl%20default%20password PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4413842/normal_60034d8313831.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380230/normal_60076e95b7d9b.pdfIn PDF document text
    • http://loxesitigogu.iblogger.org/laboratory_report_14_skull_answer_key.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418972/normal_5fdad64a163de.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450240/normal_6017359bcf478.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420030/normal_6011d79e79402.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426972/normal_5fe493b7556fc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425912/normal_5ffa6cb7ea7c8.pdfIn PDF document text
    • http://bukuvud.22web.org/where_can_the_book_of_john_be_found.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471092/normal_60026e9c5de3d.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/kufazete/kebizixapokumewuvujo.pdfIn PDF document text
    • https://s3.amazonaws.com/jenagubadopi/video_er_hd_facebook.pdfIn PDF document text
    • https://s3.amazonaws.com/tuxenipup/74107327117.pdfIn PDF document text
    • https://s3.amazonaws.com/fedure/35366704194.pdfIn PDF document text
    • http://fawivemepogu.epizy.com/unisa_funza_lushaka_application_form_2018.pdfIn PDF document text
    • http://monawob.epizy.com/kati_chakrasana_information_in_marathi.pdfIn PDF document text
    • http://vavazewesepato.epizy.com/hypernatremia_treatment_guidelines_2017.pdfIn PDF document text
    • https://s3.amazonaws.com/genedonapubefe/dokunoveruxatawexinixilun.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_off0000e3d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3D4 5360 bytes
SHA-256: cc754ad6e9eedee33318baa3e6519891e8f57aaaa22c3b298a559272ad63e064
font_01_sfnt_off0000f648.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF648 10612 bytes
SHA-256: 01e4179169221b9354f37c0ba490f0232c60bd0fdf1112a3162d1a0e59cefe9c

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