Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef5bf2acfa8902b0…

MALICIOUS

PDF

76.9 KB Created: 2021-03-20 20:13:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 16d2e9b23c0f0d40da8216a730e26642 SHA-1: 9cd9557c27d396e6ade2f7f638a0f6bcf98ca272 SHA-256: ef5bf2acfa8902b022fb438b48f3abd901c23108b83af25e20c5dafd74f527fe
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The heuristic PDF_SEO_LINK_FARM indicates the presence of a large number of external links, with 'item-mask.top' being a notable example. The embedded URL 'botokaw.ru' also points to a suspicious domain, suggesting a phishing or malicious content delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://botokaw.ru/strik?utm_term=ford+mustang+2021+release+date PDF link annotation
    • http://item-mask.top/clinical_laboratory_hematology_3rd_editionkeajk.pdfIn PDF document text
    • http://eurofamily.pro/vuxafozng6s.pdfIn PDF document text
    • http://italiahot.fun/piano_music_for_studying_mp3_downloadpzfy4.pdfIn PDF document text
    • http://foguwefo.iblogger.org/xebuzod.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/wurivuve/aashiqui_3_song_ringtone.pdfIn PDF document text
    • https://010f2e21-25ca-4560-806d-08cbbb7c7db1.filesusr.com/ugd/74a852_0f50bda208f148b1a9bd7bfbc285f70e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c0c9754-7e4b-4c37-a93f-9bc7e3520ee7/multiple_intelligences_lesson_for_elementary_students.pdfIn PDF document text
    • https://s3.amazonaws.com/xupimaral/small_letter_s_template.pdfIn PDF document text
    • https://s3.amazonaws.com/pegek/bhagavad_gita_explained_in_simple_english.pdfIn PDF document text
    • https://s3.amazonaws.com/xulepiwa/block_breaker_3_apk_data.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/89804e7e-a6dc-4c00-b2f4-b85919034615/atkins_attack_phase_foods.pdfIn PDF document text
    • https://s3.amazonaws.com/panokojol/lapadibagobuxuga.pdfIn PDF document text
    • https://s3.amazonaws.com/busutafitufe/38108021901.pdfIn PDF document text
    • http://rojapamun.epizy.com/fishing_report_delaware_bay_nj.pdfIn PDF document text
    • https://7133fc40-0b9c-4701-b953-e7fafc934b44.filesusr.com/ugd/70a38d_caa73868cf014eba833cc00394c592e5.pdf?index=trueIn PDF document text
    • https://23751d96-d7b3-42ca-b8ca-e459b671ea95.filesusr.com/ugd/7de994_a118e70864a84b07ae716297ac89d4ba.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/likerajatob/allan_kardec_livros.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/53f2a5a6-bae3-4cd7-ad93-2788ec5a9759/staples_mailmate_shredder_repair.pdfIn PDF document text
    • https://s3.amazonaws.com/rozebofukixus/37741937312.pdfIn PDF document text
    • https://a12a05ab-6462-4855-b086-b0a2a961d6d8.filesusr.com/ugd/2c76f4_56bc54315c8b417c94e0ab55723fb9d2.pdf?index=trueIn 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_off0000ee3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE3E 5428 bytes
SHA-256: 9a39c639f59633794968cc5d23b56e4ebf31e4ff417317f1c77759b4de687ca5
font_01_sfnt_off000100a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100A0 10964 bytes
SHA-256: 17e66f926a7bbadd16b4841898b14476f66fe2a12354f13f68947c40a21d1c1b

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