Malicious PDF — malware analysis report

Static analysis result for SHA-256 512cabacf2bcb75f…

MALICIOUS

PDF

74.8 KB Created: 2021-02-24 13:32:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 43540b994cacb1973b06773176ce9711 SHA-1: a802139cd4ca6fdd2c2918a36fbebad7f77688a1 SHA-256: 512cabacf2bcb75f0e9a5e943345c8644cfa56d7959538a6d7defad984c3fede
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. It contains numerous external links, many pointing to disposable hosting, suggesting a link farm or phishing lure. The presence of embedded URLs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicate an attempt to redirect users to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jacksth.ru/strik?utm_term=moultrie+m40+camera+setup PDF link annotation
    • http://pinezov.iblogger.org/57182675142.pdfIn PDF document text
    • http://kikawogax.iblogger.org/adding_and_subtracting_fractions_grade_6_worksheets.pdfIn PDF document text
    • https://cdn.sqhk.co/sebutarukaw/ijcvMge/rufozurabojomodatowowez.pdfIn PDF document text
    • https://cdn.sqhk.co/zenetofuma/ijVijif/newikibatukujupogubadej.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404750/normal_601555d735fc3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389085/normal_60308ac4656a3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368468/normal_601d5ecd3d98b.pdfIn PDF document text
    • http://kino-vezde.ru/lumewuvul3pe92.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://todonoto.epizy.com/medarozanagoje.pdfIn PDF document text
    • http://liwusetokabozil.epizy.com/60036614624.pdfIn PDF document text
    • http://rufuregebedus.rf.gd/rutowiwesosexorewos.pdfIn PDF document text
    • http://dulibifusarumo.rf.gd/35894512015.pdfIn PDF document text
    • http://kodexogezetegir.epizy.com/bharat_zinda_song_ringtone.pdfIn PDF document text
    • http://zuxozodapapugu.epizy.com/what_does_a_howl_mean.pdfIn PDF document text
    • http://lotapit.epizy.com/42142521072.pdfIn PDF document text
    • http://xukomaro.epizy.com/zalenibuvosuda.pdfIn PDF document text
    • http://dalobimonutodez.rf.gd/3d_printing_in_medicine.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_off0000e631.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE631 5312 bytes
SHA-256: f615a468575fb97f948d535229e63e6653a404309d19b22d7798318a3e6e39f1
font_01_sfnt_off0000f837.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF837 11168 bytes
SHA-256: a41975c7c32b5c57400c8dbce441ab09f0cc093a8024e26b089b1e6ab5afcd26

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