Malicious PDF — malware analysis report

Static analysis result for SHA-256 bdb521b4394b29a8…

MALICIOUS

PDF

73.5 KB Created: 2021-02-26 05:23:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: b83b270f0cc92acb2c63be9ed3322f10 SHA-1: 4ef2ec4d52ded24cae159758bb69a94046f0d2ad SHA-256: bdb521b4394b29a878beb7864e946c735ca0056c752ad1424002c08896219e89
96 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The file is a PDF document that contains an embedded URL pointing to a suspicious domain, identified by heuristics and a machine learning classifier as malicious. The ClamAV detection further confirms its malicious nature. The document body, though heavily obfuscated, appears to be a lure related to air purifiers, likely intended to trick the user into visiting the malicious URL for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • 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://jacksth.ru/award?keyword=are+personal+air+purifiers+effective PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4462046/normal_5fc7ad8965d34.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487905/normal_602d7ff39c5e8.pdfIn PDF document text
    • https://cdn.sqhk.co/mijajijem/haUicwI/zujobajegujowidogegojelu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476285/normal_600514a6dd39e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426263/normal_5fcdd0e938510.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465250/normal_5fd73744cd674.pdfIn PDF document text
    • https://cdn.sqhk.co/boxewemutox/hhfbzYc/best_ringtones_for_samsung_s9_plus.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463808/normal_6023740d014aa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454286/normal_5fdde66475f87.pdfIn PDF document text
    • https://cdn.sqhk.co/xeloxilava/yCFijgw/93612750028.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485580/normal_601dbc4e70549.pdfIn PDF document text
    • https://cdn.sqhk.co/gukugifixija/CKciahd/odd_eyes_rebellion_dragon_ultimate_rare.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474222/normal_5fe675e9ba318.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484365/normal_602d552791980.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406785/normal_5fe66d3879075.pdfIn PDF document text
    • http://pufegusikozig.22web.org/miranex.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/bamepofewalada/peptide_bond_formation_ribosome.pdfIn PDF document text
    • http://navibizo.rf.gd/syra_narasimha_reddy_audio_songs.pdfIn PDF document text
    • https://s3.amazonaws.com/nopomewegobij/9599038883.pdfIn PDF document text
    • http://sivelulowu.rf.gd/dojesulojenijemigisaja.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e412.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE412 5060 bytes
SHA-256: 0dfb2db7b703e76b5500f89beac34f92bae28cf7fe55af19b452fc291c7851b8
font_01_sfnt_off0000f55f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF55F 10708 bytes
SHA-256: 9e32a667cf9f5f39e373f9432f44bf0ac090cc1cc6391ecdf9cca224eec1cd84

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