Malicious PDF — malware analysis report

Static analysis result for SHA-256 59e3603f96117e92…

MALICIOUS

PDF

75.8 KB Created: 2021-02-15 09:40:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 81d18914a0e2d05f9cbefff9782ae7e1 SHA-1: 6ea7f3f44a7dcc58d71cb58e4bbea958e3084965 SHA-256: 59e3603f96117e9236fea431bcdda6ef0318b958670f0e1c02f884eb19a18873
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • 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 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.
  • 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://baarspo.ru/strik?utm_term=et+music+player+pro PDF link annotation
    • https://fudanologakobur.weebly.com/uploads/1/3/5/3/135394175/vuboseko.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467612/normal_6021cdd21b135.pdfIn PDF document text
    • https://zikowajemaje.weebly.com/uploads/1/3/1/6/131607239/moporan.pdfIn PDF document text
    • https://nadarikiwuxat.weebly.com/uploads/1/3/2/7/132712530/0382bd51.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453115/normal_6023e3d23c0d8.pdfIn PDF document text
    • https://lidanoliki.weebly.com/uploads/1/3/1/3/131380598/nefenituxavejas-jupot.pdfIn PDF document text
    • https://votozugilom.weebly.com/uploads/1/3/1/0/131071295/3082730.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388412/normal_5fced7efb2f2f.pdfIn PDF document text
    • https://pujezifug.weebly.com/uploads/1/3/0/7/130738771/4201666.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417309/normal_5fd2cc19e41f3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4456728/normal_6008db8bdcdd9.pdfIn PDF document text
    • http://fotuxeji.iblogger.org/4849553994.pdfIn PDF document text
    • https://fuzefiwojagolo.weebly.com/uploads/1/3/5/3/135308179/9294335.pdfIn PDF document text
    • https://vusexojepaxeva.weebly.com/uploads/1/3/4/0/134096357/vafixuguj-wejawitape-rojetelo-mokab.pdfIn PDF document text
    • https://videxopejevis.weebly.com/uploads/1/3/5/3/135333638/sawadegebolup_sufinava.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4406466/normal_5fcd3e66483a1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495055/normal_601ef1454df2c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369653/normal_5fe640b989585.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jajoxutevo.epizy.com/adobe_animate_cc_banner_templates.pdfIn PDF document text
    • http://joxumokuri.epizy.com/barefoot_gen_volume_2.pdfIn PDF document text
    • http://merapuw.epizy.com/garaj.pdfIn PDF document text
    • http://zapuwoz.epizy.com/vegetables_pictures_with_name_in_english.pdfIn PDF document text
    • https://s3.amazonaws.com/fevobelijogal/dissertation_guidelines_uom_faculty_of_education.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_off0000eac1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAC1 5140 bytes
SHA-256: 5d8dff775ad6a14e46eedf61cb165166cfcdb2063016e5c601c45505647441d7
font_01_sfnt_off0000fc30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC30 11144 bytes
SHA-256: 5311c93a751b955401143da080a47cbf3a076c6a698345e637c551cd0fc8bc52

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