Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa0af4e9ad7470f6…

MALICIOUS

PDF

80.4 KB Created: 2021-02-13 19:49:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: b735920b11df88ca7a87d1fccc4024aa SHA-1: c00156a987ed1c0b6b4770c25d6e6870ca5f486b SHA-256: aa0af4e9ad7470f6da96cca46ee78979875833ec0a260b0bccff26f3026ea969
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to disposable domains and link farms, indicating a likely attempt to redirect users to malicious content. The presence of external URIs and the 'link farm' heuristic strongly suggest a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://jottigo.ru/wix?keyword=jb+hunt+driving+school PDF link annotation
    • http://podjem2.club/bibliographic_information_apa_example1286v.pdfIn PDF document text
    • http://aov.one/common_english_verbs_listwel40.pdfIn PDF document text
    • https://jazejuvo.weebly.com/uploads/1/3/4/4/134439384/pogiwarab-vezunojokej-nitikupa-xidiza.pdfIn PDF document text
    • https://dufadijikog.weebly.com/uploads/1/3/5/3/135325035/560748.pdfIn PDF document text
    • http://dektesheff.xyz/ceratitis_cosyraqrdsd.pdfIn PDF document text
    • http://svoydvalend.xyz/wojoxubo4un4w.pdfIn PDF document text
    • http://romeital.space/tuwapabibifcjc7r.pdfIn PDF document text
    • https://nopuwujipa.weebly.com/uploads/1/3/5/4/135400678/8063064.pdfIn PDF document text
    • http://qwert-ita.fun/553031732441vc84.pdfIn PDF document text
    • http://nakidki-alkantara.xyz/minecraft_1.8_cracked_hypixel_serverx0d1a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372382/normal_600e6841d4e84.pdfIn PDF document text
    • http://intereriia.com/blacksmith_tools_blacksmith_tools6w7lb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447273/normal_601dae5c4647b.pdfIn PDF document text
    • http://idealsit.space/bass_booster_pro_apkpured3dk0.pdfIn PDF document text
    • http://cetakchantek.com/216388026376sct5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490273/normal_5ffc83c137100.pdfIn PDF document text
    • http://merishwheelrecords.com/bbs_fourth_year_result_2075_with_marksheetmjd65.pdfIn PDF document text
    • http://buloshnaya.site/freeway_closure_in_houston_area12mtu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4502817/normal_601298b83adf0.pdfIn PDF document text
    • http://sexedate69.site/6th_grade_math_worksheets6kd3s.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://nemunuj.rf.gd/senuloxegim.pdfIn PDF document text
    • http://wuwepapose.epizy.com/ayo_and_teo_videos.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_off0000f13e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF13E 4944 bytes
SHA-256: a92ed8ae73bb2e948fc6ace414fd0a79f6b88648d8bf97acd9ee09c0d684424e
font_01_sfnt_off000101f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101F6 10412 bytes
SHA-256: 7f9a2c611db60c6581170cd941d203307caff9d6838f7c6077065904d18444b9
font_02_sfnt_off000125a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125A1 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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