Malicious PDF — malware analysis report

Static analysis result for SHA-256 03e1fa44be932bba…

MALICIOUS

PDF

110.3 KB Created: 2020-11-19 16:07:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 78577c76c4e8c6a46f3b86eddda7bc45 SHA-1: b3dc66d0e6f8706e9cb99cd1567d35776452d213 SHA-256: 03e1fa44be932bba0994604f380124af828a2afbe59c632b3012603c75ffd5ea
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous external links, identified as a link farm, and is flagged by ML classifiers and ClamAV as malicious. The document body, though heavily obfuscated, suggests a 'bug report' lure. The presence of external links indicates an attempt to redirect the user to potentially malicious websites for phishing or malware delivery.

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://traffset.ru/aws?utm_term=bug+report+android+7 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4446289/normal_5fabeda689c91.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410415/normal_5fa2ad722357e.pdfIn PDF document text
    • https://natagudere.weebly.com/uploads/1/3/4/5/134526504/604ef3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366376/normal_5f8762a33961c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424010/normal_5fae84947c9b9.pdfIn PDF document text
    • https://fefaxositepimu.weebly.com/uploads/1/3/3/9/133986539/tirela.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367665/normal_5f9ed8b914f9f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488809/normal_5fb582af9cba1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413696/normal_5f970856c4927.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/baxekojojexusol/64423215730.pdfIn PDF document text
    • https://s3.amazonaws.com/duzexefemosaxe/schedule_il-e_eic_tax_form.pdfIn PDF document text
    • https://s3.amazonaws.com/zukogi/dedunarevugilino.pdfIn PDF document text
    • https://s3.amazonaws.com/pivetuzadujo/ap_cyber_treasury_challan_entry_form.pdfIn PDF document text
    • https://s3.amazonaws.com/megelugik/modesto_reservoir_camping.pdfIn PDF document text
    • https://s3.amazonaws.com/tomaxade/kiwozefatefelapex.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_off00016e93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16E93 5048 bytes
SHA-256: 59731e2cd43851cf1d6bb034c12941ff7fa90bd6d04cc7052c782ecdd3563ff0
font_01_sfnt_off00017fda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17FDA 13060 bytes
SHA-256: c526f16d7d25305dd2f63b0b47344e5f8f3aaafbebe2eec6511d3b3159ce1e80

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