Malicious PDF — malware analysis report

Static analysis result for SHA-256 26ef85c2c4f3adb3…

MALICIOUS

PDF

87.2 KB Created: 2020-11-22 15:53:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: fde0a199664e43f88408a3b09957a01e SHA-1: c2b34d3ff3090f2168ebaeedf25a1e30fa82e73d SHA-256: 26ef85c2c4f3adb3041886136a400b5e98980c04157c3a5014d51d87305b98f3
156 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external links, with the heuristic 'PDF_SEO_LINK_FARM' specifically identifying a mass of external PDF links, suggesting a link farm or phishing operation. The presence of embedded URLs further supports this, pointing towards the redirection of users to potentially harmful 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://trafffe.ru/aws?utm_term=dbt+worksheets+pdf+linehan PDF link annotation
    • https://baletepo.weebly.com/uploads/1/3/0/7/130776023/sawakofoxozamokozori.pdfIn PDF document text
    • https://ziripovopibew.weebly.com/uploads/1/3/0/8/130874468/zaluxalurabusupati.pdfIn PDF document text
    • https://kizekusoviwo.weebly.com/uploads/1/3/1/4/131453028/9cdfdf45.pdfIn PDF document text
    • https://mukokoloraji.weebly.com/uploads/1/3/4/1/134131612/jemasaw_rumetisuted_pobujuzowuripib_gogagije.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/palevijuj/wakimigajumowexud.pdfIn PDF document text
    • https://s3.amazonaws.com/dudujopixejikug/leripumid.pdfIn PDF document text
    • https://s3.amazonaws.com/mesixadelomomo/define_cerebral_aqueduct_function.pdfIn PDF document text
    • https://s3.amazonaws.com/desekusoxi/mevurunod.pdfIn PDF document text
    • https://s3.amazonaws.com/welanisowari/movie_villains_defeat_4.pdfIn PDF document text
    • https://s3.amazonaws.com/luresimosip/kafijifuzupakamibobana.pdfIn PDF document text
    • https://s3.amazonaws.com/zategafozasiru/baby_birthday_pics.pdfIn PDF document text
    • https://s3.amazonaws.com/fujadabez/63371620291.pdfIn PDF document text
    • https://s3.amazonaws.com/nabifovu/minecraft_free_unblocked_game.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_off0001192e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1192E 5424 bytes
SHA-256: b89e9b07bca4bc67b700609903cefd08422f2f50a47267cf0fd32432835480c9
font_01_sfnt_off00012bac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BAC 10748 bytes
SHA-256: fd4d7167fbf7429af00d2cc5079324a9a82bfb755900dcf1fa77057dfcf0e9bb

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