Malicious PDF — malware analysis report

Static analysis result for SHA-256 991e574efabdcb41…

MALICIOUS

PDF

75.8 KB Created: 2021-03-14 20:18:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b25741a1eea24d68ccea4ec2469bd6f0 SHA-1: d614e8d58d202d2b8afc8d7539e63b4611d55477 SHA-256: 991e574efabdcb41da3346fafab8f480ef2ce7442e47831701c7c6ea54887905
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, a technique often used in link farm attacks to manipulate search engine rankings or redirect users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as phishing or a trojan. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to drive traffic to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://fokemale.ru/123?utm_term=free+leather+sunglass+case+template
    • https://fenonurel.weebly.com/uploads/1/3/1/1/131164034/7429766.pdf
    • https://linefalaxig.weebly.com/uploads/1/3/2/6/132682404/9254149.pdf
    • http://osmosiotzs.fun/810694343847q0qv.pdf
    • http://romabeveseruzor.22web.org/alpha_blondy_cocody_rock_free.pdf
    • http://ppl-nutrshopfit.website/arihant_integral_calculus_downloadk3wj5.pdf
    • https://wodanosivowifig.weebly.com/uploads/1/3/4/5/134593279/1574187.pdf
    • http://zokumujanuni.iblogger.org/vovutet.pdf
    • https://kosodakugup.weebly.com/uploads/1/3/4/6/134655388/wiluxorekizodefo.pdf
    • http://fruits-summer.fun/lean_ux_audiobookuql87.pdf
    • http://hookup154.space/language_leader_coursebook_answer_keypqafo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://kumobeba.epizy.com/phenotype_and_genotype_questions_and_answers.pdf
    • https://c788b29d-df2d-4d46-9946-349e8cce89b7.filesusr.com/ugd/a9e086_6c5b127dbfb24fe1aa6d0da1f9c3da65.pdf?index=true
    • http://jalovunenenema.epizy.com/gobudevikikezexirufuno.pdf
    • https://436c154b-1c2d-4c60-9768-ed3a268ef5e1.filesusr.com/ugd/e8e253_368f84e543a44ae2a253ec34fcf4123c.pdf?index=true
    • https://920f4c01-5fd6-4c40-8b27-b99972fecb60.filesusr.com/ugd/d63aaf_67a9f250c44b47b18b801263f8635a23.pdf?index=true
    • http://fuwasal.rf.gd/creating_android_apps_on_mac.pdf
    • http://rukotig.rf.gd/xixewozikovobolofumuti.pdf
    • http://wibitatazureb.rf.gd/e46_auto_to_manual_swap.pdf
    • http://bolozoros.rf.gd/how_do_you_identify_a_diode_terminal.pdf
    • https://24fb6454-6d29-4e6d-aa2d-76752ca8f0ed.filesusr.com/ugd/2f8cea_406c151600f24235bb157534ad6ba19f.pdf?index=true
    • https://b46c4cda-4951-41c0-816f-bbf02eee4d9b.filesusr.com/ugd/4ff992_166722dcc4814792bfa968e5e979317d.pdf?index=true
    • https://c8070bf9-ed42-4c5d-8eb8-ca35ee70f136.filesusr.com/ugd/d38238_e120a2b524fc45c18dbbe0d3fed626ba.pdf?index=true
    • http://rokodukewab.epizy.com/wurew.pdf
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db8e.bin
618a68dd6f88bb90dbd025d47e5a821e93eecccf85b4eda726de8bbb629a7dc9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDB8E 5028 bytes
font_01_sfnt_off0000ec77.bin
2428011a4165edc5c63875350ef6fbbe4a6d1646dc4dab7daa35649f8d4de861		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC77 10896 bytes
font_02_sfnt_off000111e7.bin
7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71		 pdf-font-stream PDF embedded font (sfnt) at offset 0x111E7 4324 bytes

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