Malicious PDF — malware analysis report

Static analysis result for SHA-256 08628a63f02d41a4…

MALICIOUS

PDF

66.4 KB Created: 2021-02-02 12:39:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: af365d0995befff8fd969b3205f4287c SHA-1: a2694407baf517107bfe22f45c505dd2de05398c SHA-256: 08628a63f02d41a4aa3270fb8f4742e7e9075f757530e316f40124fa32e2965a
126 Risk Score

Malware Insights

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

The sample is identified as malicious by ClamAV and an ML classifier, and it contains numerous external URIs, including a link farm on disposable hosting. The document body, though heavily obfuscated, suggests a lure related to an 'Electric field intensity calculator'. The presence of multiple PDF_URI heuristics indicates an attempt to redirect the user to external, potentially malicious, websites.

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://leonvi.ru/123?utm_term=electric+field+intensity+calculator PDF link annotation
    • http://fiselijuduguge.iblogger.org/4935454947.pdfIn PDF document text
    • https://wesuzimowigimeb.weebly.com/uploads/1/3/4/7/134745326/xumegadisafopid.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393034/normal_5fdb3e691ac78.pdfIn PDF document text
    • http://faceskinagainbeauty.xyz/gaxumunumideger4ne8e.pdfIn PDF document text
    • https://toxinezewam.weebly.com/uploads/1/3/1/4/131452950/jemadatis_sakadoxak_sadavekuguzan.pdfIn PDF document text
    • https://cdn.sqhk.co/fuwufupi/IW2vgjq/fire_drill_siren_sounds.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446502/normal_5fcb2e7fd2af1.pdfIn PDF document text
    • https://rafowatixi.weebly.com/uploads/1/3/0/8/130874563/zeladulevifo.pdfIn PDF document text
    • http://draiwenstore.online/womozaronikixofopivyf4v9.pdfIn PDF document text
    • https://cdn.sqhk.co/kerutadit/jG3whj4/55177603908.pdfIn PDF document text
    • https://cdn.sqhk.co/xuwifoviwalo/1hgeZAl/my_talking_tom_2_hacked_apk_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476768/normal_6017212d45ad5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xavisijividefo.epizy.com/dedekusudo.pdfIn PDF document text
    • https://s3.amazonaws.com/salade/fibunisuwabez.pdfIn PDF document text
    • https://s3.amazonaws.com/libowebujakux/direct_speech_punctuation_worksheet_ks2.pdfIn PDF document text
    • https://s3.amazonaws.com/wanasuvedigo/soxofexupez.pdfIn PDF document text
    • http://vutafinaragod.rf.gd/559873323.pdfIn PDF document text
    • https://s3.amazonaws.com/jijumupade/nebajafasidixo.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_off0000c7c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7C4 5076 bytes
SHA-256: 4a914efa60d4c99d1fa06ecd7ef5e47a36e86322957a2528bf7f7186b11dac59
font_01_sfnt_off0000d923.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD923 10296 bytes
SHA-256: 9d24266db6171417a94884ba8ba4c3c5e734a3bafbdc6b069bba628c2a23a668

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