Malicious PDF — malware analysis report

Static analysis result for SHA-256 18bb399b8d69328a…

MALICIOUS

PDF

91.2 KB Created: 2021-02-17 08:52:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 7aa826865be9549fd4da7568ffbbc3a4 SHA-1: b0102c6148cfe5c778355cbb220bfd84a80606ca SHA-256: 18bb399b8d69328a7ee6ef7a9cb3fb2357d12436bf01bb8ba8732e823db53df3
192 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 finding for linking to known malicious redirector infrastructure. The ML classifier also strongly indicated maliciousness. The embedded URLs and the nature of the heuristics suggest this document is part of a phishing or malware distribution campaign, likely attempting to lure users to malicious sites by disguising itself as a manual or deal information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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/wix?keyword=sentry+safe+lost+owners+manual In PDF document text
    • http://meinekarten.best/15047588586jeyfe.pdfIn PDF document text
    • https://mowazaxof.weebly.com/uploads/1/3/4/7/134704653/445821.pdfIn PDF document text
    • http://kinoogf.space/brawl_stars_apk_mod_private_serverhxmoi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465264/normal_5ff3b89c194e0.pdfIn PDF document text
    • http://vinnipoh.fun/bolasigevezusuriditxvxtu.pdfIn PDF document text
    • http://submonster.xyz/27054897303cxjhc.pdfIn PDF document text
    • http://merovew.xyz/black_friday_tv_deals_uk_43_inchixq4a.pdfIn PDF document text
    • http://osmosiotzs.fun/eureka_math_grade_4_module_1_worksheetsqynq9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467043/normal_5fdfa1d142011.pdfIn PDF document text
    • http://cryogen.me/46432649846vo44x.pdfIn PDF document text
    • http://drnextact.xyz/rupinder_gandhi_2_hd_moviez4osb.pdfIn PDF document text
    • https://javekekowunafot.weebly.com/uploads/1/3/5/3/135324960/gadutituk_wazabuponar_milivo_vegolob.pdfIn PDF document text
    • http://remontnatali.ru/61728600160c066a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389361/normal_5febd588482a8.pdfIn PDF document text
    • http://buytoday.cc/vepowwaqsy.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011232.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11232 2828 bytes
SHA-256: dd7b880f1c6958317b71933e3175eb4154b1281d355b69180e4ce829e506ee21
font_01_sfnt_off00011c2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C2C 5044 bytes
SHA-256: 8c6aebdfea3257f6a2f9407797af72539916d1a1e1bb11e8b231e7afd009eaae
font_02_sfnt_off00012d4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D4E 10052 bytes
SHA-256: 176547db9b84aa4538cb76983c3539712ae30dc05f8acacfdcdffe15faf443fe
font_03_sfnt_off00014f9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F9D 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71

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