Malicious PDF — malware analysis report

Static analysis result for SHA-256 7bb1c07fc00e1483…

MALICIOUS

PDF

74.3 KB Created: 2021-02-23 01:46:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 411a589ceee224c528238b81be303d23 SHA-1: d4494d1bfdccafc2d636bb2e0e6d7bb9fd41ed01 SHA-256: 7bb1c07fc00e14834539686a1390f0f70fc085e31ec208af16f156be2f0a41aa
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are to PDF files, suggesting a link farm or a method to distribute further malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The document body text is heavily obfuscated and unreadable, but the presence of external links and the heuristic firings point towards a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://druttle.ru/strik?utm_term=is+there+a+gregor+the+overlander+book+6 PDF link annotation
    • https://cdn.sqhk.co/disumuneriva/3gggcq1/ant_factory_apk_mod.pdfIn PDF document text
    • http://prechambre.xyz/memurujumozudilododuld444e.pdfIn PDF document text
    • http://theharaka.online/jurnal_hernia_diafragmatikaj50vh.pdfIn PDF document text
    • https://cdn.sqhk.co/torujazelome/iajcMRG/68381515610.pdfIn PDF document text
    • https://lirupije.weebly.com/uploads/1/3/1/6/131606624/cc2268f7a95c77.pdfIn PDF document text
    • https://ruvezidarumova.weebly.com/uploads/1/3/1/3/131380493/7160166668.pdfIn PDF document text
    • http://mjawebdesign.net/netgear_n600_wifi_cable_modem_router_instructionszwuca.pdfIn PDF document text
    • https://voteriboxovoviv.weebly.com/uploads/1/3/4/3/134352377/ridafomufudova.pdfIn PDF document text
    • http://dragonflysagewellness.com/jifazexitidiwuvixa7el63.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497369/normal_601cb1fb7033f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pinukemedorurol.rf.gd/sojinoto.pdfIn PDF document text
    • https://s3.amazonaws.com/folexapurilowe/89690287403.pdfIn PDF document text
    • http://pikimavijepe.epizy.com/kosikedeligodemotup.pdfIn PDF document text
    • https://s3.amazonaws.com/jovekus/blockhouse_bay_intermediate_uniform.pdfIn PDF document text
    • https://s3.amazonaws.com/wujafivabipo/memumelaxonakelipo.pdfIn PDF document text
    • https://s3.amazonaws.com/kopisigapub/automatic_car_driving_tutorial.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_off0000e369.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE369 5440 bytes
SHA-256: 78fc3545060c8363cc074bcf56a6b2ac878f081ef340006d32f01fd48db3d6cb
font_01_sfnt_off0000f5ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5EA 11156 bytes
SHA-256: a47f6568b4cea132d1e90854789fafb730f96587427f85747f6d81c363ddc4ac

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