Malicious PDF — malware analysis report

Static analysis result for SHA-256 828cd9c5aa2d29b6…

MALICIOUS

PDF

65.0 KB Created: 2020-11-09 19:45:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: b25ac751240105dfb19bc44c75cca566 SHA-1: 988ea085c7e86884ebbee62e9035448d297145aa SHA-256: 828cd9c5aa2d29b6f49332c28bb2cbc49b78d5336959baf4355a6b6d37629c56
96 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains an embedded URL that, when visited, likely leads to a malicious resource. The document body, though heavily obfuscated, contains text related to a 'guide post for boat trailer', suggesting a social engineering lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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?keyword=guide+post+for+boat+trailer PDF link annotation
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/nagev/one_piece_stampede_full_movie_english.pdfIn PDF document text
    • https://s3.amazonaws.com/tevigotu/scott_stamp_catalog_download.pdfIn PDF document text
    • https://s3.amazonaws.com/sugaguxagu/learning_opencv_3_o_reilly.pdfIn PDF document text
    • https://s3.amazonaws.com/lumixi/92274861408.pdfIn PDF document text
    • https://s3.amazonaws.com/mubefula/sutixukipevusixef.pdfIn PDF document text
    • https://s3.amazonaws.com/xamibudasagas/braintree_high_school_graduation_2020.pdfIn PDF document text
    • https://s3.amazonaws.com/gozega/go_math_grade_5_workbook_answer_key.pdfIn PDF document text
    • https://s3.amazonaws.com/dobesogum/giwowowivafikatab.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/faf6e168-3079-49c8-9787-559358f07788/sindhi_to_english_dictionary.pdfIn PDF document text
    • https://s3.amazonaws.com/palikuvexake/garazizuvekegixozin.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files2/74242002505.pdfIn PDF document text
    • https://s3.amazonaws.com/xupimaral/nasiligukigamotenuto.pdfIn PDF document text
    • https://s3.amazonaws.com/bulozor/mods_for_minecraft_apk_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/44dec038-de67-40cc-9626-676c71f74d79/mastering_essential_math_skills_book_2.pdfIn PDF document text
    • https://s3.amazonaws.com/mefadedosuw/juvavanosobuxutu.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b670.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB670 4984 bytes
SHA-256: 9a1bb8be70b5f77152e87168c476ba4311961b2da2ad55835ee2f1675280cf91
font_01_sfnt_off0000c772.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC772 9924 bytes
SHA-256: dfbf68d71f1856a74fa55b4f5ba8ec448e17b722b70c2218f0eaf156ef62ce85
font_02_sfnt_off0000e957.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE957 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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