Malicious PDF — malware analysis report

Static analysis result for SHA-256 83a67cc6d988c35f…

MALICIOUS

PDF

72.0 KB Created: 2020-12-28 18:15:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 471baccc6928040f4b5305966e4c5e4e SHA-1: 97dc34e9b04de4ab9162f78a849d76ddf2cb81fc SHA-256: 83a67cc6d988c35fdd184d47ea63b5921f2c948a10fd2ff303c86bd9500060fe
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 a ClamAV signature and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains an embedded URI pointing to 'https://trafficel.ru/aws?utm_term=charlie+brown+teacher+speaking', which is a strong indicator of a phishing or malware distribution attempt. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the presence of the external URI and the malicious verdict strongly suggest a phishing or credential harvesting attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://trafficel.ru/aws?utm_term=charlie+brown+teacher+speaking PDF link annotation
    • https://cdn.sqhk.co/zikegasenar/gfsIhaX/snapchat_icon_black_png.pdfIn PDF document text
    • https://cdn.sqhk.co/reretukida/ehelZ5v/nocrop_photo_editor_square_pic_square_fitted.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366987/normal_5f874a5f3369f.pdfIn PDF document text
    • https://cdn.sqhk.co/rubekafux/gnhihfE/cool_name_maker_for_pubg.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/f42a0690-fa08-41d7-9efd-0eb694bb9996/panen.pdfIn PDF document text
    • https://s3.amazonaws.com/xefejevife/haier_cpn10xcj_10000-btu_portable_air_conditioner_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7682f83a-e382-48e6-adbf-a825acbafcd5/frases_de_snak_el_ripper_lbumes.pdfIn PDF document text
    • https://s3.amazonaws.com/dazifozixawus/consider_yourself_lyrics_az.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a4df970e-7131-4289-bef0-db180c948298/couch_cushion_support_boards.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a772984a-fbe7-438f-b3bb-9d13a11a9380/lefurebazo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f6bc4b76-51e3-48db-967b-ac0c1e0d875d/90241013341.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e4b264a4-02fe-4535-b159-3e9dae502129/rawinuvevupuzelaloguf.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_off0000de1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE1A 5396 bytes
SHA-256: 5be62402ff3d3493b87070ae5d8824b57116f752e8ce1f9dfc7edaf91b6f4dae
font_01_sfnt_off0000f07b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF07B 10164 bytes
SHA-256: 22fb97d06e8d3d1d18eeeb914359a3ae6a202a1881f920f8434014ed28f765b4

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