Malicious PDF — malware analysis report

Static analysis result for SHA-256 09755bb177cbc396…

MALICIOUS

PDF

78.6 KB Created: 2021-03-24 20:00:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 15d002dddd25bbb03620489756799f49 SHA-1: 1205266576dafee04688f4559acade87f010c25a SHA-256: 09755bb177cbc396fe11f43bfdb00e8fec0e2abd29f226a42da5c6c85f02bc48
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs pointing to disposable domains, a common tactic for phishing and malware distribution. Heuristics indicate it's a link farm on disposable hosting, and ClamAV detected it as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest malicious intent to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pelibifir.ru/award?keyword=curso+balconista+de+farmacia+pronatec+pdf PDF link annotation
    • http://lizoguxumugef.mywebcommunity.org/synonyms_and_antonyms_worksheets_grade_5.pdfIn PDF document text
    • http://tilikef.mygamesonline.org/6933470784.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390374/normal_605acfc21b42b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460708/normal_602ca7401321d.pdfIn PDF document text
    • http://memowelubi.mygamesonline.org/bevugupafesederob.pdfIn PDF document text
    • http://xifogoweru.22web.org/mr_coffee_fresh_tea_iced_tea_maker_instructions.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366014/normal_604aad89cf9bd.pdfIn PDF document text
    • https://sixebujexe.weebly.com/uploads/1/3/0/7/130740217/2849816.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416501/normal_5fdb1abb57b3f.pdfIn PDF document text
    • https://cdn.sqhk.co/gasidonoda/3ljciaa/filipino_cupid_android_app.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476273/normal_5ffd39da0f5a5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426421/normal_6026d07e0ba6b.pdfIn PDF document text
    • http://ramifapufebi.scienceontheweb.net/piwabuwijutiwusoru.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462696/normal_605537be9a35d.pdfIn PDF document text
    • https://pibitodasako.weebly.com/uploads/1/3/0/9/130969140/6c94e70faa1.pdfIn PDF document text
    • https://birewabozokufa.weebly.com/uploads/1/3/0/8/130814216/7434840.pdfIn PDF document text
    • https://cdn.sqhk.co/pesasotiro/aChbibB/68409191623.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410030/normal_6004cff59b0d6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379852/normal_5ff7c3d5b4045.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rebipilu.epizy.com/98029903299.pdfIn PDF document text
    • http://tofalit.myartsonline.com/control_systems_engineering_8th_edition.pdfIn PDF document text
    • http://bozolukiket.epizy.com/carbohydrate_metabolic_disorders.pdfIn PDF document text
    • http://nepejalaziba.rf.gd/79428722053.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF48 5344 bytes
SHA-256: 52d27d5638aedc66088ccec9cfa7dc74f9fc4b540b8bf9c5aa388e0146a390d8
font_01_sfnt_off00010155.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10155 13988 bytes
SHA-256: d130ad190e3b1c9abcd7b2d2430aac04a6faee4a3884808a089b55ac6e28a147

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