Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bb56459e46f9ce7…

MALICIOUS

PDF

86.8 KB Created: 2021-02-23 14:24:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5e372e116eecc30c38329fa8081cfa76 SHA-1: 844f87a30d158117fdb26e991e3dcb999f79b098 SHA-256: 4bb56459e46f9ce794365fbbf1c15feafee37085b044135ffe7ab88d8b6d98b1
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various PDF documents. One of these links, https://maypoin.ru/strik?utm_term=is+moto+g+1st+gen+4g, is directly embedded in the document's metadata. The ML classifier and ClamAV detection strongly indicate maliciousness, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://maypoin.ru/strik?utm_term=is+moto+g+1st+gen+4g
    • https://cdn.sqhk.co/raxoxawupej/xSjfhjM/munesunegemoranazi.pdf
    • https://cdn.sqhk.co/wadupaxi/jbBigHf/what_song_you_dedicate.pdf
    • https://tebojejuket.weebly.com/uploads/1/3/4/7/134764489/b03fc69bf9d12.pdf
    • https://tedajurilazunu.weebly.com/uploads/1/3/0/7/130739962/1a73c1e586.pdf
    • http://lejuxetuvi.iblogger.org/tigipaxulutiw.pdf
    • https://xirovule.weebly.com/uploads/1/3/4/7/134749068/3807563.pdf
    • https://lubikumak.weebly.com/uploads/1/3/1/4/131453733/siwowobijen.pdf
    • https://cdn.sqhk.co/vixemujomu/jiXyAij/relaxing_music_nature_sounds_free_download.pdf
    • https://kizerovum.weebly.com/uploads/1/3/4/7/134747257/fesokekibesej_favepadarop_megigimozonin_zepogekobita.pdf
    • https://cdn.sqhk.co/fuvebopeweb/eUfs7ne/59071613160.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fedorahosted.org/lohit
    • https://s3.amazonaws.com/sixolose/ketoacidosis_management_guidelines.pdf
    • https://s3.amazonaws.com/jinotugiwomo/eir_sport_tv_guide_today.pdf
    • https://s3.amazonaws.com/nuxepiduded/bridgestone_ecopia_ep422_review_consumer_reports.pdf
    • http://kafudunafow.epizy.com/16227165580.pdf
    • https://s3.amazonaws.com/xetasif/92851529624.pdf
    • https://s3.amazonaws.com/feseni/double_glazed_sheets_of_glass.pdf
    • https://s3.amazonaws.com/bibejovixapis/73344979078.pdf
    • http://zonadomafi.rf.gd/44805651027.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_off0000f4cb.bin
18dbd60b4bf8cc41c7913177add7dc9ac2b8c77529238d3086bf08b25c317f0d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF4CB 4744 bytes
font_01_sfnt_off000104ef.bin
7427616c0bd176e48a3e71e9f6feda315e648ad2384d7f637d7d5706e2f64722		 pdf-font-stream PDF embedded font (sfnt) at offset 0x104EF 11836 bytes
font_02_sfnt_off00012db9.bin
bece938af6993a88fa0e9201e77f8ff424eff693de990aa3a0eadeb85108dcc7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12DB9 9832 bytes

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