Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec4dc24bbc9108fc…

MALICIOUS

PDF

76.8 KB Created: 2021-03-01 00:29:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: d7e07b44334e52ccc330f5e57626dada SHA-1: 5f89bc250de42a7c9fc0157406217ba62c085299 SHA-256: ec4dc24bbc9108fc24578e231804edbabfbe031e1477500947f2fa58a4c97063
126 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to disposable domains, characteristic of link farms used to distribute phishing content or malware. The PDF structure and embedded links suggest an attempt to redirect users to external malicious sites, likely as part of a phishing campaign or to download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://botokaw.ru/award?keyword=calculus+of+variations+with+applications+gupta+pdf PDF link annotation
    • http://vuvulusigi.scienceontheweb.net/cambridge_ielts_9_listening_test_3_questions.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443344/normal_601808c51aa11.pdfIn PDF document text
    • http://rasezatoxefu.mygamesonline.org/fisisazidukawufola.pdfIn PDF document text
    • https://sijujufe.weebly.com/uploads/1/3/4/6/134696532/fudem.pdfIn PDF document text
    • https://cdn.sqhk.co/mijajijem/6igm5jc/84461313027.pdfIn PDF document text
    • https://cdn.sqhk.co/tobijoge/OjahcLs/53947909188.pdfIn PDF document text
    • http://ruguwafe.scienceontheweb.net/developing_effective_communication_skills_ppt.pdfIn PDF document text
    • https://lenukanaferu.weebly.com/uploads/1/3/0/8/130873899/546c9297.pdfIn PDF document text
    • https://lupolaluxu.weebly.com/uploads/1/3/2/6/132681144/840041926d1fb.pdfIn PDF document text
    • https://detaxenenikub.weebly.com/uploads/1/3/0/7/130776267/parekugofetola-jefumaje-govabum-sepoledub.pdfIn PDF document text
    • https://cdn.sqhk.co/goxobuve/psyicjh/brazil_football_world_cup.pdfIn PDF document text
    • http://bawesijum.22web.org/book_report_sample_7th_grade.pdfIn PDF document text
    • https://gupoxebexu.weebly.com/uploads/1/3/4/3/134337811/sapoza-sepulanizanutek.pdfIn PDF document text
    • https://zikotidule.weebly.com/uploads/1/3/4/6/134604350/dajogemak.pdfIn PDF document text
    • https://cdn.sqhk.co/wewuxujudu/impihUW/brain_training_games_online_uk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404103/normal_602979109038b.pdfIn PDF document text
    • http://vevaxogejaz.scienceontheweb.net/99541176271.pdfIn PDF document text
    • https://cdn.sqhk.co/vizinifum/c8jh5pt/wawuj.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://zuraravata.epizy.com/joint_problems.pdfIn PDF document text
    • http://ruzupaxenerod.epizy.com/kokumekanevodasoleravuki.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_off0000e0ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0AE 5356 bytes
SHA-256: 88786e8040b777d09a7b6f94e0003e21901239833872285db89890df30d0c28e
font_01_sfnt_off0000f2e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2E6 10932 bytes
SHA-256: 76b2ce607a1c84bc9df7591e15f5024fad95cb7aec7fc01cda819b61905a30a1
font_02_sfnt_off00011753.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11753 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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