Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf32afb1e636e547…

MALICIOUS

PDF

78.2 KB Created: 2021-02-02 10:24:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 41635083d89e1d4b8fb915a5bc0cebdd SHA-1: c7030e0477f12e88ddf56ac5bd07cf31480e4131 SHA-256: bf32afb1e636e5477acc80698c8725e90390eca7756e8a75b1639f4119f2019a
96 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URI pointing to a suspicious domain, 'crophysi.ru', which is likely used to host a malicious payload or redirect to a phishing page. The document body, though heavily obfuscated, suggests a lure related to chemistry education, which is a common tactic for social engineering.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://crophysi.ru/123?utm_term=why+do+elements+in+the+same+family+have+similar+chemical+properties PDF link annotation
    • http://jewlgems.com/safari_2020_price1zqjs.pdfIn PDF document text
    • http://jilet1.club/fanuc_arc_mate_100ic_manual6mo1x.pdfIn PDF document text
    • http://lifegirls.site/zidixavezaxebedimotunolif6gjgz.pdfIn PDF document text
    • http://kemytbok.xyz/tractores_hanomag_r60js3j7.pdfIn PDF document text
    • http://mnogolidov.xyz/detevuzarl05l.pdfIn PDF document text
    • http://devlp.design/guruterojofewikekv6wh.pdfIn PDF document text
    • http://mnatural.space/63136725084pbo02.pdfIn PDF document text
    • https://dakewamegiru.weebly.com/uploads/1/3/5/3/135305658/b20ca4246c83041.pdfIn PDF document text
    • https://tinonerapize.weebly.com/uploads/1/3/5/3/135349756/texupun_jepoka.pdfIn PDF document text
    • https://fojozotewimoko.weebly.com/uploads/1/3/5/3/135324817/9799179.pdfIn PDF document text
    • http://choosemadam.site/76575832660slu0s.pdfIn PDF document text
    • https://telavepifamika.weebly.com/uploads/1/3/4/3/134352802/larosomo.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/dotivaf/align_text_center_in_spinner_android.pdfIn PDF document text
    • https://s3.amazonaws.com/wipotegadodorek/blue_eyes_full_song_mp4.pdfIn PDF document text
    • https://s3.amazonaws.com/domegagowevag/free_aviation_navigation_apps_for_android.pdfIn PDF document text
    • https://s3.amazonaws.com/xuxifuzituwu/wutud.pdfIn PDF document text
    • https://s3.amazonaws.com/bufipevuril/salon_appointment_book_template.pdfIn PDF document text
    • https://s3.amazonaws.com/lekelepowo/lowifegivovejigenus.pdfIn PDF document text
    • https://s3.amazonaws.com/jeromisixinolib/72369309301.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cf43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF43 5572 bytes
SHA-256: 4f2c1b34c9d5cf4146a92f6dc6d24dc8d921206c4e628665ce4630f67358d6cc
font_01_sfnt_off0000e1e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1E3 6168 bytes
SHA-256: 96f6da995762294ea3a4027012fe6abcaa176fb300c6cb737c1f5ddadc5a0795
font_02_sfnt_off0000f0c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0C9 10344 bytes
SHA-256: 7c0556e9056b0fc3c5cb354d51faaf89bf26649d69496bea78796fab2a49d917
font_03_sfnt_off0001145c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1145C 16240 bytes
SHA-256: 80c51b54dd3b4d24ca28254839bdb9fa09f7250201dab70cd0358418171aafc9

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