Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d0423f4fa720b18…

MALICIOUS

PDF

77.1 KB Created: 2021-03-23 09:29:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7d198ca6d25f2a6ffbc75702af593108 SHA-1: 207b0d31412f42ffefd7c500a5fd3a48f2093d86 SHA-256: 7d0423f4fa720b18b2abba6b59b70ebbe81d58f8da4629c36d4055234f28bf9d
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to other PDFs, suggesting a link farm or phishing operation. The ClamAV detection and ML classifier strongly indicate maliciousness, likely related to phishing or malware distribution. The embedded URLs are the primary indicators of compromise, directing users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://resalured.ru/wix?keyword=lesson+5.1+skills+practice+answers
    • https://static.s123-cdn-static.com/uploads/4410714/normal_5fee78c17c195.pdf
    • https://cdn.sqhk.co/rabovafom/P40xlgg/weather_clock_widget_pro_apk.pdf
    • https://cdn-cms.f-static.net/uploads/4367283/normal_6013a7cbe914f.pdf
    • https://cdn.sqhk.co/xegogeji/3Hgcjih/38523659347.pdf
    • https://cdn.sqhk.co/bulunazi/ibdKZjh/mirakebemuxebesuwevib.pdf
    • https://cdn.sqhk.co/dubutemaruxu/IibhdC2/nebijolat.pdf
    • https://buvapubadoloj.weebly.com/uploads/1/3/4/2/134265521/rudazemef.pdf
    • https://cdn-cms.f-static.net/uploads/4492901/normal_602f60a33d13d.pdf
    • https://zajoralesame.weebly.com/uploads/1/3/0/9/130969459/507164.pdf
    • https://cdn.sqhk.co/dodipenameki/hfncVge/laponixigapexujobejuvojef.pdf
    • https://cdn.sqhk.co/sadetujadufi/iegigjd/7584178658.pdf
    • https://cdn.sqhk.co/josipinu/hdhaugc/family_fun_center_bowling_shoes.pdf
    • https://buranujepexu.weebly.com/uploads/1/3/4/3/134339299/3038670.pdf
    • https://cdn.sqhk.co/ketusugedi/ibhbijP/lowifokulugixol.pdf
    • https://static.s123-cdn-static.com/uploads/4386597/normal_600775b2a65fb.pdf
    • https://cdn-cms.f-static.net/uploads/4419851/normal_600bbc1ece560.pdf
    • https://pebawozo.weebly.com/uploads/1/3/4/8/134865175/xutiwan.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://b20aee1f-b1b7-4e4e-be5e-d884e4ece670.filesusr.com/ugd/10e3af_b75596c1d9f446dab19fe64e33146945.pdf?index=true
    • https://s3.amazonaws.com/juwofuxufijup/daily_oral_language_3rd_grade.pdf
    • https://73f4d879-981c-49fe-abc7-520f36a14a84.filesusr.com/ugd/b77b08_03f1c3f26ed04c3c98a0a94b8b943054.pdf?index=true
    • https://74269c25-1731-4359-90d4-804f54ef9c1c.filesusr.com/ugd/b5973a_39820a942f0245ef999e9d880559556c.pdf?index=true
    • https://s3.amazonaws.com/regovadeje/bully_scholarship_edition_apk_free.pdf
    • https://f8ba888e-8f71-4fde-8303-550399648f4e.filesusr.com/ugd/17ce20_0c8d1f58c9234160a21e095049d6930d.pdf?index=true
    • https://s3.amazonaws.com/gumegulaxi/city_mini_gt2_weight_limit.pdf
    • https://87c8fc71-818b-4167-bf0d-2ac3bc49ffd1.filesusr.com/ugd/f9d4cd_61bfcf5be22a40fbb679804193eb6374.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000efc3.bin
e3476afc71b68b5e6dfec2026c224f6857b9457a859953cefbbe5efadc65560f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC3 5232 bytes
font_01_sfnt_off000101c4.bin
ab3184bf1c6af259ec8522039f9d40d6af0e44124897ea782025290ae0dc72fb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x101C4 10896 bytes

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