Malicious PDF — malware analysis report

Static analysis result for SHA-256 d16b517281617dda…

MALICIOUS

PDF

72.9 KB Created: 2021-02-06 15:06:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 1d20fb06a3ddfd4bbf2846ac89596e3e SHA-1: 476233e6730b1f74161eaab67c56977e18bdb884 SHA-256: d16b517281617dda2e3fbd11864c579118a83bd179800da024027c27e790e1dd
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with several pointing to known malicious redirectors or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, contains text related to 'ff14 fisher leveling guide', likely a lure to disguise the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://yafferge.ru/123?utm_term=ff14+fisher+leveling+guide+60+70 In PDF document text
    • http://ru-1.casa/zuluzuzukirimebitalopalgib55.pdfIn PDF document text
    • http://losqutoq.online/729016844503n892.pdfIn PDF document text
    • http://in-step.shop/zoxifimaxomitxl7qn.pdfIn PDF document text
    • https://cdn.sqhk.co/natefisaka/AhCrEhf/milusorodonexabuwufoviti.pdfIn PDF document text
    • https://cdn.sqhk.co/goberirud/jjT52Hj/rome_total_war_barbarian_invasion_cheats_ios.pdfIn PDF document text
    • http://kernig.online/werewolf_wallpaper_apk_downloadb6smo.pdfIn PDF document text
    • http://bovafigirom.22web.org/alien_skin_exposure_x4_crack.pdfIn PDF document text
    • https://cdn.sqhk.co/kojogitu/shbifQ1/gold_mountain_golf_course_cascade.pdfIn PDF document text
    • http://successinyourlif.website/refudabakarinajon3cd.pdfIn PDF document text
    • http://mx50off.pro/59620795187wj0id.pdfIn PDF document text
    • http://probnik1313.tech/69109014805tppuo.pdfIn PDF document text
    • http://healthyforczechrepublic.site/solid_waste_management_nptelw8xpx.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
    • https://s3.amazonaws.com/jazamerijekufol/first_grade_reading_skills_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/saxefi/inverted_commas_worksheet_year_2.pdfIn PDF document text
    • https://s3.amazonaws.com/wovisak/four_year_degree_plan_template.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d37b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD37B 5184 bytes
SHA-256: 2297a76101fccee0c6a05c5e4f9e4b522d407f4fecd1c09320264bb433ca5332
font_01_sfnt_off0000e520.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE520 10392 bytes
SHA-256: 12fafd3d1b018e4ca52cf570f16324b073718c561d154662b40e875eab09fa69
font_02_sfnt_off00010878.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10878 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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