Malicious PDF — malware analysis report

Static analysis result for SHA-256 3acd4bad91e77691…

MALICIOUS

PDF

73.3 KB Created: 2021-01-25 21:41:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 8505930f03ab766b59271a5b087c1a97 SHA-1: 2276bca3faad94cf2a4930716597396f200a0aac SHA-256: 3acd4bad91e77691a7c642aa1b4d94c9264ec96e8f598100a550bcdcf35086cb
96 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, with a high risk score. It contains an embedded URL pointing to 'baarspo.ru', which is likely part of a phishing or malware distribution scheme. The document body, though heavily obfuscated, suggests a lure related to a book summary, consistent with social engineering tactics.

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://baarspo.ru/123?utm_term=she+comes+first+book+summary PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4402717/normal_5fe2802ed8cc8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489595/normal_5ff41b40cde09.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366319/normal_5fe532f549c8a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4492918/normal_6002faaaa3368.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403806/normal_5fe0f37e47b80.pdfIn PDF document text
    • http://copyrightram.net/978595515964r9cp.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427504/normal_5fe74e796ffbe.pdfIn PDF document text
    • http://prazdnikprosto.ru/skydrive_flying_car_for_sale6im2v.pdfIn PDF document text
    • http://gimakelodikovij.iblogger.org/leatherworking_guide_tbc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459058/normal_5ff35773b0bff.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://s3.amazonaws.com/forupokisip/wavefront-_guided_lasik_vs._wavefront-_optimized_lasik.pdfIn PDF document text
    • http://bonizeza.epizy.com/vcaa_english_examiners_report_2016.pdfIn PDF document text
    • http://wexugemo.epizy.com/lodixuguravisiduxoxezod.pdfIn PDF document text
    • https://s3.amazonaws.com/veraxawewib/imo_olympiad_worksheets_for_class_2.pdfIn PDF document text
    • https://s3.amazonaws.com/tugumeb/verb_1_2_3_form_list.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_off0000d24d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD24D 5276 bytes
SHA-256: fe8d4d5f50037f43de6371f2484106c5971888f1ec2010381b2427376032da61
font_01_sfnt_off0000e444.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE444 11160 bytes
SHA-256: c1dfe22ef42217b85194d2f8c662abb44dd872b1c630d1e7be5f994956cc076c
font_02_sfnt_off00010a35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A35 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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