Malicious PDF — malware analysis report

Static analysis result for SHA-256 b507110d7b5d82b2…

MALICIOUS

PDF

84.5 KB Created: 2021-05-28 06:20:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f5219f38ea106572c237f7860bc871f3 SHA-1: da7f6a5308409b7c0b30855eed2187cb1aff100b SHA-256: b507110d7b5d82b2631ce25be80f513f9fdb15c3f793bdb434b9d7088bcd3dbd
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 identified as a phishing trojan. It contains an embedded URL that directs users to a suspicious domain, likely as part of a phishing or credential harvesting scheme. The document body, though heavily obfuscated, suggests a lure related to 'All the bright places book or movie'. No scripts were extracted, but the presence of an external URI is a strong indicator of malicious intent.

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://botokaw.ru/strik?utm_term=all+the+bright+places+book+or+movie
    • https://cdn-cms.f-static.net/uploads/4487623/normal_606bcca8ba405.pdf
    • https://static.s123-cdn-static.com/uploads/4393018/normal_5ff17fc970d5e.pdf
    • https://cdn-cms.f-static.net/uploads/4487201/normal_60533f0a5b3ab.pdf
    • https://cdn-cms.f-static.net/uploads/4449987/normal_602bb2a949658.pdf
    • https://cdn-cms.f-static.net/uploads/4372101/normal_6066fb48d31e7.pdf
    • https://static.s123-cdn-static.com/uploads/4459060/normal_60055da56d981.pdf
    • https://cdn-cms.f-static.net/uploads/4412758/normal_60464173d60d8.pdf
    • https://cdn-cms.f-static.net/uploads/4484993/normal_60125f3dc1343.pdf
    • https://cdn-cms.f-static.net/uploads/4445735/normal_600b4296a5813.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/29f678bb-188f-4773-b29d-a7553323cea7/kenmore_300_series_washer_and_dryer.pdf
    • https://uploads.strikinglycdn.com/files/7d1f9189-e5cc-49dc-9955-304e4ce4086f/19465717103.pdf
    • https://uploads.strikinglycdn.com/files/4a435657-0e46-4e57-84f3-3b9ecc1a9067/37469083689.pdf
    • https://uploads.strikinglycdn.com/files/d64d1089-86a1-49e2-8d2c-b2380cd8ce82/30499943729.pdf
    • https://uploads.strikinglycdn.com/files/aaae1304-4456-4696-8ec3-4372fb1853ad/the_good_life_board_game_review.pdf
    • https://uploads.strikinglycdn.com/files/d1bee6c0-e243-4af4-aa9a-e774e9275eaa/23746768749.pdf
    • https://uploads.strikinglycdn.com/files/9820a90e-d7bc-47d4-8482-50d336913088/6695269320.pdf
    • https://uploads.strikinglycdn.com/files/03890f07-9a7e-4409-a232-d5d621fd9d54/4923607783.pdf
    • https://uploads.strikinglycdn.com/files/e616a73a-8f1f-421d-bd3f-c7b4682866e1/penuratubim.pdf
    • https://uploads.strikinglycdn.com/files/5127c159-6169-4903-a129-5103489133b9/competitive_programming_book_java.pdf
    • https://uploads.strikinglycdn.com/files/391e3e4a-4a5b-4b11-a78f-7eedf3d7d000/33767255576.pdf
    • https://uploads.strikinglycdn.com/files/a49b7d08-b658-4d2e-953e-5e88df14b020/32823915698.pdf
    • https://uploads.strikinglycdn.com/files/d19dc38b-e973-47f6-a283-d013c1a9000e/how_to_wash_chicco_nextfit.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fd1c.bin
a116338ff52dab9355d6cdd38f8de6f3cc2974810ffdc3a5c71a3a6b59b83517
pdf-font-stream PDF embedded font (sfnt) at offset 0xFD1C 5280 bytes
font_01_sfnt_off00010f12.bin
1f4c0265b737ba64c832789050f7015695b920e347bccd12c01beb6241afa8ea
pdf-font-stream PDF embedded font (sfnt) at offset 0x10F12 11036 bytes
font_02_sfnt_off0001348b.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f
pdf-font-stream PDF embedded font (sfnt) at offset 0x1348B 4324 bytes