Malicious PDF — malware analysis report

Static analysis result for SHA-256 a40426ce0a4cb361…

MALICIOUS

PDF

73.5 KB Created: 2021-06-07 08:25:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 21cde895accb5cf6abb62f0f69441c1f SHA-1: 05eabb405acfeabd5f810ebfd13400a41491d24f SHA-256: a40426ce0a4cb36193021b559bcefcf7c458d980c454350fbc5f6d07a710b3f7
96 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains an embedded URL that, when visited, likely serves as a lure for phishing or malware delivery. The document body, though heavily obfuscated, suggests a pretext of providing an 'answer key' to entice users.

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://pixomot.ru/pbw?utm_term=commonlit+answer+key+everyday+use PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4454559/normal_60418a59394c7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389820/normal_601a81558a0e0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374953/normal_603b80475954e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450148/normal_605ee296d14c8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385880/normal_60178a2524e21.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450513/normal_60251f5577756.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446790/normal_6067f2c16e59e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387816/normal_6041665e3c0f8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458417/normal_603bdbf6b96b6.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/d152a94c-d69e-4799-b6b7-87da0823ad89/5r55w_transmission_repair_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/89d6fae5-67d3-4fca-abff-2a7323cd05a5/who_does_china_give_foreign_aid_to.pdfIn PDF document text
    • http://pinurakus.pbworks.com/f/how_to_do_a_sliding_knot_bracelet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/953af016-6c9c-4269-b857-bf54b4bcac51/godin_a6_ultra_natural_sg_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/db8b52d3-1bb1-4b51-b03e-ea6cb7400561/95104713937.pdfIn PDF document text
    • http://liwuvedesisu.pbworks.com/f/fupefanupugoxiwuxug.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3bd53a48-6e1a-4c0c-96f2-a0f3baf60fbc/what_is_cloud_computing_in_aws.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/76aa310b-65a3-45d1-82b2-4fe155e0a2d6/what_was_the_point_of_the_95_theses.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b1085903-87ba-4271-98f9-91a4ab8b2eed/black_and_decker_weed_trimmer_line_replacement.pdfIn PDF document text
    • http://fodorafirig.pbworks.com/f/oh_oh_enthan_baby_tamil_mp3_song_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cb85a13a-fa2a-443e-a4df-65074642d919/pidarijuxifofugot.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_off0000e2be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2BE 5192 bytes
SHA-256: 2829f3a7b738d6b7485500f9af14acd688b15823366e34036feabb8ab42f8859
font_01_sfnt_off0000f467.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF467 10644 bytes
SHA-256: 8a879f917d9b6108f024411a80ce67b020a2ad0587674106c6c6a7bbc2e7e147

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