Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4dbc2790fe57458…

MALICIOUS

PDF

77.4 KB Created: 2021-03-14 05:05:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: ab0c14cc001681cea5517bf4e67216f5 SHA-1: 1748c214de989b4afc79a049031a1f07341bbbde SHA-256: f4dbc2790fe57458e05ee4d5ca5eb44ec5e12d382d952c39c6ed70301f556ee5
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/award?keyword=analog+oscilloscope+pdf'. This URL is likely used to phish for user credentials or download additional malicious content. ClamAV also detected the file as 'Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0', further indicating malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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.
  • 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/award?keyword=analog+oscilloscope+pdf In PDF document text
    • https://static.s123-cdn-static.com/uploads/4475204/normal_6007e357e81ee.pdfIn PDF document text
    • http://rimiripa.mypressonline.com/gazixan.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366045/normal_5fc9cce88e8e1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4456121/normal_6008dab99ba31.pdfIn PDF document text
    • https://cdn.sqhk.co/lowuxegas/ejjRhav/climate_change_report_2019_uk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4499958/normal_6004d9ef38a7f.pdfIn PDF document text
    • http://xolokeminapi.getenjoyment.net/16421933653.pdfIn PDF document text
    • https://cdn.sqhk.co/vinasujitupe/PSih8gg/17467720161.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413842/normal_5fd3cdfdea003.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403951/normal_602f79fe1a1e8.pdfIn PDF document text
    • https://cdn.sqhk.co/zetobazox/hiUyjjT/dodilapomabazu.pdfIn PDF document text
    • https://cdn.sqhk.co/tajalawad/goihRid/sepaxuvuzomiwikewawegoru.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375908/normal_60390cf8b5f95.pdfIn PDF document text
    • http://fekowepiz.mywebcommunity.org/beachbody_21_day_fix_calendar.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wenares.myartsonline.com/canon_powershot_elph_170_is.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d0900526-b8c1-40dc-8fef-d267be07ccb1/58715671906.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a71af9f6-c42b-4306-9e03-ad0ad968b1e7/how_to_feel_at_peace_with_yourself.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0748e3f8-c8b8-46d3-8a53-beb4c16ada0b/samsung_55_inch_smart_tv_6500_series.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c10c0446-8018-4d4a-93db-aab2bd78226e/how_can_i_reset_my_wii_u_gamepad.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_off0000f22e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF22E 5216 bytes
SHA-256: 3bbf325d9ffcbf70a5cfa982ad8ccee1aa35b0100ffe73a6c6f177704cacb289
font_01_sfnt_off0001040a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1040A 10200 bytes
SHA-256: 59b467e76e699acaeaae7ed9a986cc52fcd48b83262ff52dd72cb6be1acdaac8

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