Malicious PDF — malware analysis report

Static analysis result for SHA-256 b43da4001ea416ec…

MALICIOUS

PDF

201.1 KB Created: 2020-12-25 00:56:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 0e3661e8b5f8b4ccdab2db92810d3eee SHA-1: b3dc17b89ef65c27aabbbe7c617e324981e967af SHA-256: b43da4001ea416ec8a5ac83047c544423cce319565600477b2fafe78437cd112
96 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, with a specific detection name indicating it's a PDF phishing trojan. It contains an embedded URL pointing to a suspicious domain, which is a common tactic for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URI suggest an attempt to redirect the user to a malicious site, likely as part of a spearphishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://trafffi.ru/aws?utm_term=esc+anticoagulation+guidelines+2017 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4366027/normal_5fcd12f64de0e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372963/normal_5f889c4a39ff5.pdfIn PDF document text
    • https://sidilatadafexu.weebly.com/uploads/1/3/1/1/131164021/xemitekopa_nimixukixilo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365612/normal_5f9ce690eac34.pdfIn PDF document text
    • https://vetidemilutuzu.weebly.com/uploads/1/3/4/4/134492936/1901586.pdfIn PDF document text
    • https://tiwovukixata.weebly.com/uploads/1/3/4/3/134314311/b4b09.pdfIn PDF document text
    • https://zimiduninu.weebly.com/uploads/1/3/1/6/131637103/1824750.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/8d48b7b1-6000-4c68-8144-9ee8b0d39249/33821412585.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b6580204-419c-4872-bdce-0554750df878/edc_girls_golf_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/vuliwisuwig/77310017463.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a6419a2-66f1-4c07-83b0-3a95a1d3f619/93480462901.pdfIn PDF document text
    • https://s3.amazonaws.com/sefabe/asphalt_8_airborne_music_tracks.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6eb23cc4-37be-47f4-8782-7ce71d175ae9/como_se_usa_localizador_de_apice.pdfIn PDF document text
    • https://s3.amazonaws.com/zunewidimem/epfl_phd_thesis_latex_template.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0002c511.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2C511 5376 bytes
SHA-256: 6aac7b15b5499d072f354b410e9bff3d9859a6c88fd82ee94b1220a629394023
font_01_sfnt_off0002d77a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2D77A 12420 bytes
SHA-256: a108cf16741efeef2252f23c5683958d33736a3bae91d8ba80b76641b840a7ed
font_02_sfnt_off000300b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x300B0 16148 bytes
SHA-256: 49436f94d5abf10ca6af8af9848174aab82dfe7bc58a5146411d238fd5c76648

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