Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b6757992d243647…

MALICIOUS

PDF

77.7 KB Created: 2021-02-13 01:51:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-06-05
MD5: c7f2da01427666013e879ac3d86f97c1 SHA-1: 344d3cd2fc53ec8dcad7a873d931ca321df842d7 SHA-256: 3b6757992d243647d2cec61f5250d6b8e238d409766451abe8da39b5c549e396
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many pointing to disposable domains and employing UTM parameters, indicative of a link farm designed to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this malicious intent. ClamAV detection and ML classification further confirm its malicious nature, likely serving as a phishing or malware distribution vector.

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
  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://leonvi.ru/123?utm_term=journal+of+black+psychology PDF link annotation
    • https://wanesutilujat.weebly.com/uploads/1/3/4/8/134868149/tufulo_rimej.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380228/normal_600d96708016a.pdfIn PDF document text
    • https://cdn.sqhk.co/miburixegapu/4sijGyQ/wakiwej.pdfIn PDF document text
    • https://tefajarusi.weebly.com/uploads/1/3/0/7/130775660/rijomab.pdfIn PDF document text
    • http://card2card.live/boxers_diet_plan_weight_lossxola9.pdfIn PDF document text
    • http://sportplays.ru/alcatel_lucent_ip_touch_user_manual9wi1h.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465400/normal_5ffd85d122da9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408707/normal_6025b8bad7184.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485927/normal_5fcc6fba8803d.pdfIn PDF document text
    • https://dataremidesop.weebly.com/uploads/1/3/4/6/134697992/logisoboxalum.pdfIn PDF document text
    • http://tixshopclub.fun/xagamuponalajigs5gvo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487625/normal_5fcaf56f5b484.pdfIn PDF document text
    • https://cdn.sqhk.co/wukomidekepu/Fheggeg/36305551285.pdfIn PDF document text
    • https://wilukogata.weebly.com/uploads/1/3/5/3/135388132/1344297.pdfIn PDF document text
    • https://bitojobuf.weebly.com/uploads/1/3/4/8/134892495/zasojaju.pdfIn PDF document text
    • https://cdn.sqhk.co/wuvinudubuno/qiijcHa/41520689046.pdfIn PDF document text
    • https://cdn.sqhk.co/damapegapi/iinTaid/jopovej.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378641/normal_5fe0b97fbc39e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gijodege.epizy.com/freytag_triangle_worksheet.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d96b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD96B 5572 bytes
SHA-256: 9639c9a09eb9c78d5a2a57f6beafe44da3ad5b7640bc88c0c18c3aa215a53178
font_01_sfnt_off0000ec68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC68 10828 bytes
SHA-256: 1216cfb54216921a2ef6087e5f4d6ed634c4bc94e6cbdf8b0da295938deb124f
font_02_sfnt_off00011153.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11153 17020 bytes
SHA-256: 4b2d657542b943a567eea0cc2ca7ec76f35891bcc180190e3c449040f69dc5d7

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