Malicious PDF — malware analysis report

Static analysis result for SHA-256 f75c1fd588567975…

MALICIOUS

PDF

373.0 KB Created: 2021-03-15 05:59:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: c4def4b45fa583b07a776ed128bffdbf SHA-1: 3d3f6ab7e4562563cb54606a7740933763dfee46 SHA-256: f75c1fd588567975c693a5c6c91cbd5bb72c1360159b8781c0d72ded143a6ff4
96 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URL that appears to be part of a lure, referencing 'audio amplifiers databook pdf' to entice clicks. While no scripts were explicitly extracted, the PDF structure and embedded URI heuristic suggest an attempt to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9666

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://resalured.ru/award?keyword=audio+amplifiers+databook+pdf PDF link annotation
    • https://mefufexuwi.weebly.com/uploads/1/3/4/0/134019004/watekolapuvexeb_zizivovojapaj_dubezobef.pdfIn PDF document text
    • https://notuvovezed.weebly.com/uploads/1/3/1/3/131382721/480f810e2a552.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4498376/normal_5fe22f5e1334f.pdfIn PDF document text
    • https://farunekigevizaj.weebly.com/uploads/1/3/5/9/135976182/1692972.pdfIn PDF document text
    • https://bovatukal.weebly.com/uploads/1/3/0/7/130739183/satarilekewemem.pdfIn PDF document text
    • https://pamokevavazodo.weebly.com/uploads/1/3/4/3/134386981/c6c8adf.pdfIn PDF document text
    • https://tevoletefe.weebly.com/uploads/1/3/1/6/131606261/mumowutebegevi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449185/normal_6000ad0a6cda5.pdfIn PDF document text
    • https://kadefevexenikoz.weebly.com/uploads/1/3/0/8/130813118/xebizasa.pdfIn PDF document text
    • https://fafovufurivu.weebly.com/uploads/1/3/2/6/132695925/1cf99a4e2.pdfIn PDF document text
    • https://wibujiwegawej.weebly.com/uploads/1/3/4/8/134899761/tekunavupo_salonaf_wezokakan.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381289/normal_6043799d225d7.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/befarekogol/71938622651.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7b36f1a5-b511-4027-8bf4-43a56c1565d9/what_does_margin_of_safety_ratio_show.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/93604b4b-3a15-4c53-804a-25443a1f7376/afterglow_headset_mic_not_working.pdfIn PDF document text
    • https://s3.amazonaws.com/sepovutapakogaf/kopuziv.pdfIn PDF document text
    • https://s3.amazonaws.com/sasufufa/adobe_reader_merge_free.pdfIn PDF document text
    • https://s3.amazonaws.com/nowokil/89656216904.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/df84b282-81ac-4683-96f1-fd2c9179bb71/how_to_fill_sodastream_bottles_at_home.pdfIn PDF document text
    • https://s3.amazonaws.com/pujirageg/pedavesebene.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_off00058648.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x58648 5380 bytes
SHA-256: 9c81606d8be3304f98c4e4ca8fcec722adfc9b341fb1dca9ae0cf41b44ad8ac3
font_01_sfnt_off0005987d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5987D 13148 bytes
SHA-256: 3a1d3404607168276731ef61d6839b16e5a0db5a6e02b320d19f32d7f3560f84

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