Malicious PDF — malware analysis report

Static analysis result for SHA-256 a21ed538aa37df4f…

MALICIOUS

PDF

72.5 KB Created: 2020-12-20 06:42:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 066e564878c94ad49ad33c0c134fb88e SHA-1: 7b73400df407d378db92de1bb230e6fdd2f8f3a7 SHA-256: a21ed538aa37df4fd923ef63c1a7736e525fc234aaad3c3a3cf61a3cc7ef76a1
96 Risk Score

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 URI pointing to a suspicious URL, which is likely part of a phishing or malware distribution scheme. No scripts were extracted, but the presence of the malicious URL and the overall detection strongly suggest a phishing attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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/strik?utm_term=animal+body+systems+worksheet PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4388041/normal_5f908acfa7585.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/5fc0ebd09955c744b53ba8af/t/5fc13188f3de5e49b58faa63/1606496650887/18469660083.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/990eaaf2-9543-4ea4-ad82-b8c32d4ae63b/retro_handset_for_mobile_phone_india.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbe17922dd96f5918b68023/1606293395088/talk_talk_discography_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ab93cf0a-3d78-47f3-bc09-2f383050edc1/88546682624.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d287c11b-c80f-45b9-abdf-b06d654aad03/lisewidogu.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc7ab43778af068263feaea/t/5fcb293426a2be7f6ddffd5a/1607149876516/bandit_king_bakura_x_reader.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc5b620bd14ff0dd2bd8369/t/5fcbf287f94b6402b20333ca/1607201415552/dnd_5e_animal_companion_ranger.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bde0142a-134b-4827-a9ed-d051dc7ea7c1/analisis_wacana_eriyanto.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/60e2283b-806f-4333-94c2-38c4e1222095/gramatica_c_gustar_with_nouns_answer_key.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_off0000e0fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0FA 5452 bytes
SHA-256: bc488ecd87c7a8a3488e705585cd47a24882bef1d7dcf318ddb631cd22f3a057
font_01_sfnt_off0000f365.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF365 10032 bytes
SHA-256: 950f666be5e3b8ba3f178973a6feaf49d497789fc5677ce1a21602c48dd340b1