Malicious PDF — malware analysis report

Static analysis result for SHA-256 121263c597e5a8b0…

MALICIOUS

PDF

72.6 KB Created: 2021-01-14 02:28:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: c5fb70642aafb0ec9b03b67e582586de SHA-1: 20ecd0ea8aeae2906a97985577500602a56bd047 SHA-256: 121263c597e5a8b0073507d7133cd41f12373781cd6d7d3630d5beef6a53e7c5
184 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical alert for linking to known malicious redirector infrastructure. The ML classifier also assigned a high probability of maliciousness. The embedded URLs suggest a link farm designed to funnel users to potentially malicious content, with one URL specifically pointing to a known malicious redirector.

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
  • 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://gettraff.ru/wb?keyword=baby%20night%20light.%20lulababies%20offline.%20com In PDF document text
    • https://site-1171867.mozfiles.com/files/1171867/78504979775.pdfIn PDF document text
    • https://site-1177610.mozfiles.com/files/1177610/bosexiwivusiger.pdfIn PDF document text
    • https://site-1234635.mozfiles.com/files/1234635/79200135554.pdfIn PDF document text
    • https://site-1173944.mozfiles.com/files/1173944/empire_angle_meter_level_protractor.pdfIn PDF document text
    • https://site-1202150.mozfiles.com/files/1202150/taurus_horoscope_today_astrology_answers.pdfIn PDF document text
    • https://site-1166704.mozfiles.com/files/1166704/64014663850.pdfIn PDF document text
    • https://site-1173610.mozfiles.com/files/1173610/birafajojazivumixop.pdfIn PDF document text
    • https://site-1178850.mozfiles.com/files/1178850/9641957913.pdfIn PDF document text
    • https://site-1174826.mozfiles.com/files/1174826/cowboy_candy_dip_recipe.pdfIn PDF document text
    • https://site-1176039.mozfiles.com/files/1176039/jixonedenivokabupibowe.pdfIn PDF document text
    • https://site-1172875.mozfiles.com/files/1172875/86393848093.pdfIn PDF document text
    • https://site-1176728.mozfiles.com/files/1176728/19111507881.pdfIn PDF document text
    • https://site-1174422.mozfiles.com/files/1174422/36849389693.pdfIn PDF document text
    • https://site-1168056.mozfiles.com/files/1168056/46740509088.pdfIn PDF document text
    • https://waxebusesu.weebly.com/uploads/1/3/4/7/134770319/naxara.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000dc4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC4B 5520 bytes
SHA-256: 7b57d58a31676d16d4b8893e34812a6ad62c0b887a8ef2d6c4ba71729b1e3872
font_01_sfnt_off0000ef0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF0C 11104 bytes
SHA-256: 21bb45b0ad2a919106e306855049ec842f6fcaacf390b648288b14dc4422fe39

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