Malicious PDF — malware analysis report

Static analysis result for SHA-256 57a3b31a9eacdfc4…

MALICIOUS

PDF

68.5 KB Created: 2021-03-23 18:12:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 6f7e04661768af57cce8c1d1fb8f2d72 SHA-1: ca510a5b034b9d590cf9d64620e8942eacc18e92 SHA-256: 57a3b31a9eacdfc4b3b732290765d64290bdc69616dacb6c13d9ea726404c554
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, with one prominent URL pointing to a domain associated with phishing. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. The document body, though heavily obfuscated, appears to be a lure related to a 'manual for electric smoke hollow digital', aiming to trick users into visiting the malicious URL.

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 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/wix?keyword=manual+for+electric+smoke+hollow+digital PDF link annotation
    • https://kikurexabo.weebly.com/uploads/1/3/5/3/135325422/9324954b198.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392474/normal_5ff310de3beee.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459326/normal_604d8c3c04f20.pdfIn PDF document text
    • https://pimalikatirowo.weebly.com/uploads/1/3/4/0/134040386/1753727.pdfIn PDF document text
    • https://jufasoxoko.weebly.com/uploads/1/3/5/3/135315704/givodaxepuk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4503524/normal_5fe5dbeb282b5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416659/normal_5fed9329212a0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413701/normal_60367d4f0167a.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/wegemebufojafak/sales_consultant_cv_template.pdfIn PDF document text
    • https://s3.amazonaws.com/nefomojuwet/86658785069.pdfIn PDF document text
    • https://s3.amazonaws.com/kalanejaxutilif/applied_informatics_vs_computer_science.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9bf488d7-7e41-41b1-958e-8c21a52d4b4a/disgraced_ayad_akhtar_audiobook.pdfIn PDF document text
    • https://s3.amazonaws.com/bisazabe/38435522951.pdfIn PDF document text
    • https://s3.amazonaws.com/nuxulikiwab/zuxepuvakiwotakesoxo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/de027947-35ca-48e4-95cc-549df8df4b6d/vicks_germ_free_humidifier_v3900_instructions.pdfIn PDF document text
    • https://s3.amazonaws.com/zesixefe/assassins_creed_renaissance_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d99c7621-0370-4ec1-8038-84ba9a283fd4/wonesomipebixudax.pdfIn PDF document text
    • https://s3.amazonaws.com/bexolamabad/71068663180.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_off0000cf2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF2C 5596 bytes
SHA-256: cdef21d9e2e341a4bbf3c94cdb0daf91f827974478858a328e330a50b63a799a
font_01_sfnt_off0000e22b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE22B 10156 bytes
SHA-256: 371b72929d21a724091c193d870b4818e5bfa670e5336c249f11bd3a1d35fb84

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