Malicious PDF — malware analysis report

Static analysis result for SHA-256 84dcf42d16630148…

MALICIOUS

PDF

113.1 KB Created: 2020-12-17 04:55:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: a7be7ab25d008f8f7f7e40683adeb0e3 SHA-1: b9bcfdf1579e4541e5f2ae0452e9ba5bf6991e8f SHA-256: 84dcf42d166301485334004c98a2121c286cbd9b1c52ad2706089bafd964f7c6
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many pointing to Weebly-hosted PDFs, indicating a link farm or phishing campaign. ClamAV and ML classifiers also flagged this file as malicious, specifically as a phishing trojan. The presence of embedded URLs and the PDF structure strongly suggest an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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://trafftec.ru/123?utm_term=world+atlantic+airlines+ice PDF link annotation
    • https://mufedagejex.weebly.com/uploads/1/3/4/7/134726032/43a349bf4de6ea5.pdfIn PDF document text
    • https://gasogufimuti.weebly.com/uploads/1/3/4/4/134461051/4a3d7f.pdfIn PDF document text
    • https://tidukefawa.weebly.com/uploads/1/3/4/8/134851120/sogemunupazade.pdfIn PDF document text
    • https://mivosubewo.weebly.com/uploads/1/3/1/4/131407796/8146336.pdfIn PDF document text
    • https://kubupukadumu.weebly.com/uploads/1/3/1/3/131382740/denerad_sebegodidiker_duwegoxivefow.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453108/normal_5faddec7f1e64.pdfIn PDF document text
    • https://rokufekajo.weebly.com/uploads/1/3/0/8/130814342/vuvolonasase-jijifidelenum-lemilaj-dexiboxe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482027/normal_5fda96b6d949d.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/gavapozalilup/fleece_fitted_sheet_full.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c574a90b-6a2f-4b9b-a681-1256c365c65a/star_wars_revenge_of_the_sith_full_m.pdfIn PDF document text
    • https://s3.amazonaws.com/penale/30447314168.pdfIn PDF document text
    • https://s3.amazonaws.com/bulalowisu/75111370087.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/95960185-3165-4b16-b573-b63ea7bef78d/zekadilibarikadurimiwobu.pdfIn PDF document text
    • https://s3.amazonaws.com/welutizenop/lejomidutufobibunifeja.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_off00017fc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17FC1 4948 bytes
SHA-256: b2ae1ec893e6f682cac2bd34350bb07be296964c172eb72c1eee31a6a41e57dc
font_01_sfnt_off000190aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x190AA 11228 bytes
SHA-256: 5ed6ff5ef394d357aa2e3c8a1b0ae95924e214032d3f40b3b3e0ddc5e61c4439

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