Malicious PDF — malware analysis report

Static analysis result for SHA-256 362c514394b40b65…

MALICIOUS

PDF

77.0 KB Created: 2020-11-24 15:54:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: b3c3b1f1a4fca51023be282259197f2d SHA-1: b2454ddc15bd28dead35d1f3a29bac7a8960f036 SHA-256: 362c514394b40b65a2c28b1a6d3098dd63fd1b51f5767a935ed4fd2fbd97d5c4
104 Risk Score

Malware Insights

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

The file is a PDF document flagged by ClamAV as a phishing trojan and by an ML classifier with high confidence. It contains an embedded URL that appears to be the primary lure, disguised as a guide or invoice. While no scripts were extracted, the PDF structure and embedded URI suggest an attempt to redirect the user to a malicious site for further exploitation or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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/strik?utm_term=c+programming+absolute+beginner%2527s+guide+epub PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4384468/normal_5faae3ed50e61.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417214/normal_5f9699c2babb3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370778/normal_5f9081362435b.pdfIn PDF document text
    • 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://uploads.strikinglycdn.com/files/9f5feaa3-f19e-4174-91b9-4f6a557bad1c/24033940408.pdfIn PDF document text
    • https://s3.amazonaws.com/bugutaj/96617845928.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5b2c5e4f-bac5-4097-9c3f-46c840104d68/na_step_working_guide_free_download.pdfIn PDF document text
    • https://s3.amazonaws.com/subud/personality_disorders_dsm_5.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/20f648ac-8fdd-4d2f-a8e6-4111cf80b490/75288847586.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a2f3bc58-9ebb-4ae9-af6f-0d77837abe90/integer_word_problems_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/saxefi/51949260547.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b0dfe0cf-cabf-4569-8a4c-8571bf00c460/77680374068.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/396d50a9-f9f9-4537-8d6c-dbc0d50fd232/servsafe_coursebook_7th_edition_free.pdfIn PDF document text
    • https://s3.amazonaws.com/batiku/dobexapukuvojaseko.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/935d184c-28b1-401b-88e4-bf785766cbe8/autodesk_revit_2018_content.pdfIn PDF document text
    • https://s3.amazonaws.com/zoromexemuzid/veruxizopulimep.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_off0000dd94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD94 5356 bytes
SHA-256: a1bba9199d8da89878796e92d67affe5c9dc74ea14266b950d95c87a59a6c4b0
font_01_sfnt_off0000efb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFB1 12356 bytes
SHA-256: 3b0f5ea44ed91de86ebd44f07059d80c5feb5d51b7802e3b24fd88c7cc733041
font_02_sfnt_off0001184d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1184D 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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