Malicious PDF — malware analysis report

Static analysis result for SHA-256 933c0ad9e03e8bbe…

MALICIOUS

PDF

66.9 KB Created: 2020-12-17 12:40:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 4ceba237ba56bc26be12fae3ead8ddd1 SHA-1: 3829a86ece606f3c3ce22d0b0e9aaceb739d7a51 SHA-256: 933c0ad9e03e8bbe687ca7233672c914dcd48ac88a0d433220da370bdab3a0c9
96 Risk Score

Malware Insights

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

The PDF file was detected as malicious by a machine learning classifier and ClamAV, flagging it as a phishing trojan. The document body, though partially corrupted, contains text suggesting it is related to 'Epa section 609 test answers'. A suspicious external URI, 'https://trafffi.ru/123?utm_term=epa+section+609+test+answers', was extracted, which is likely the primary vector for the malicious activity. No scripts were extracted, but the presence of a malicious PDF and a suspicious URL strongly suggests a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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/123?utm_term=epa+section+609+test+answers PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4391340/normal_5fc5f5b26064d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fc5458bbdb33045eedefd2a/t/5fc8cd2bee804a17a1da2031/1606995245157/21052125380.pdfIn PDF document text
    • https://s3.amazonaws.com/juduk/coliform_bacteria_in_water_symptoms.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b4a1a371-6966-4066-8558-9b43800f18de/gretna_middle_school_la.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ec35bd04-1763-470d-a9d2-ce9fca123b5d/zoveno.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0f6c4e5c7695ca99bf722/t/5fc3ce647acac6192a34e4d8/1606667876982/mn21_a23_battery_equivalent.pdfIn PDF document text
    • https://s3.amazonaws.com/xezujuxoz/scorpio_man_aries_woman_yahoo_answers.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc7aba6778af068263fedd7/t/5fd604495b1f6f7539ccfcd3/1607861325576/riddles_in_english_with_answers.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc57e136609fd0ee7b098e0/t/5fcdb0c25d2e6f3bda5aed19/1607315651791/nizapetas.pdfIn PDF document text
    • https://s3.amazonaws.com/vonusirukete/fishing_guide_ffxiv.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0c362403f5353fd950a5e/t/5fc0ec3708845d0924abc0be/1606478905173/best_apk_mods.pdfIn PDF document text
    • https://s3.amazonaws.com/kavitokolezub/75741826111.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc01ccfc14dfd36feed28e9/t/5fc31dda6457125654a295af/1606622683193/wikafogiwevipafewaxif.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_off0000c81d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC81D 5396 bytes
SHA-256: 0d1da28bb0d80dec59b64ce6f3d8e4a7dea7609305e02b7cf92be7c8a6918468
font_01_sfnt_off0000da92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA92 10740 bytes
SHA-256: 1f7c85fed066b71cb5a9f72bbff605d2a67bfa47265b569f91e04eff778dae32

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