Malicious PDF — malware analysis report

Static analysis result for SHA-256 d78900a99b06ad32…

MALICIOUS

PDF

82.2 KB Created: 2021-01-23 15:14:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 672dd9d69c325b4aae6ca930ae36df69 SHA-1: d38d01b764581bd1cff160e2412efd85e70f9b67 SHA-256: d78900a99b06ad3229f101ff5e8f9eb6f498f2276ea6000159add11c3f43826f
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://yafferge.ru/123?utm_term=barney+and+friend+toys'. This URL is likely used to lure the user to a phishing or malware distribution site. The ML classifier also strongly flagged this PDF as malicious, supporting the phishing and redirection intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://yafferge.ru/123?utm_term=barney+and+friend+toys In PDF document text
    • https://cdn.sqhk.co/bexoninodag/hzRgjTS/wojezakerutenakusajudizit.pdfIn PDF document text
    • https://site-1247563.mozfiles.com/files/1247563/2018_world_cup_table.pdfIn PDF document text
    • https://site-1179889.mozfiles.com/files/1179889/tilalakasogagokidixariw.pdfIn PDF document text
    • https://site-1176713.mozfiles.com/files/1176713/zombie_objective_hack_mod_apk_download.pdfIn PDF document text
    • https://site-1176636.mozfiles.com/files/1176636/cash_flow_statement_template_indirect_method.pdfIn PDF document text
    • https://site-1166618.mozfiles.com/files/1166618/61451571671.pdfIn PDF document text
    • https://site-1260537.mozfiles.com/files/1260537/32393542360.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://ripeterub.epizy.com/17441835037.pdfIn PDF document text
    • https://s3.amazonaws.com/kopisigapub/avery_5160_and_8160_template_word.pdfIn PDF document text
    • https://s3.amazonaws.com/zeworibuzoza/resukeweluwasane.pdfIn PDF document text
    • https://s3.amazonaws.com/fakuguvil/76226257077.pdfIn PDF document text
    • https://s3.amazonaws.com/tevomenil/christmas_background_png.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA35 2960 bytes
SHA-256: a31aedb3fe800cd2b5c0120397ec9570e12c7cc97febb81e3d6171160c50e6bc
font_01_sfnt_off0000e4b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4B7 5020 bytes
SHA-256: 44718843cc7722c4ed77cf3824d51ac8370b639f41580e633f35ec6c0c9d3700
font_02_sfnt_off0000f5e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5E7 13648 bytes
SHA-256: 8881ef95a8db1dbc8d0030b054d1baa28391dd1565d8dd62966076ca5021be87
font_03_sfnt_off00012496.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12496 16140 bytes
SHA-256: 3f83bbfb2e03141a9083badfb1da6e2b1773f9aa6b1ed8f30fc2d392a5ee3553

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