Malicious PDF — malware analysis report

Static analysis result for SHA-256 f92f25bacf624c1b…

MALICIOUS

PDF

75.4 KB Created: 2021-01-18 17:41:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 709fb02bb988a94d95eb53477f35df99 SHA-1: e1f2d18a2ff6b01c72abac56fa95ac81c3be6556 SHA-256: f92f25bacf624c1be49d1941b22895731b9e5ccfe2eb4700961ebbd211f7a977
96 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. It contains an embedded URI pointing to a suspicious domain, 'crophysi.ru', which is likely used for phishing or to serve a secondary payload. The document body, though heavily obfuscated, contains references to 'Balkon's weapon mod', suggesting a lure to entice users to click the malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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=balkon%2527s+weapon+mod PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4410211/normal_5fbb88eea1ed7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4468537/normal_6001f5b135fe2.pdfIn PDF document text
    • https://site-1233233.mozfiles.com/files/1233233/fukisifafeber.pdfIn PDF document text
    • https://site-1180530.mozfiles.com/files/1180530/62071493016.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370073/normal_5fadd4e22c4f5.pdfIn PDF document text
    • https://site-1168401.mozfiles.com/files/1168401/repost_for_instagram_plus_app_store.pdfIn PDF document text
    • https://site-1176659.mozfiles.com/files/1176659/wubazajagetape.pdfIn PDF document text
    • https://site-1168413.mozfiles.com/files/1168413/30069973667.pdfIn PDF document text
    • https://site-1174866.mozfiles.com/files/1174866/best_songs_of_the_1990s_uk.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/tiniruru/elder_scrolls_blades_build_guide.pdfIn PDF document text
    • http://lebozid.epizy.com/photoshop_background_images_hd_psd_free.pdfIn PDF document text
    • https://s3.amazonaws.com/bofake/avengers_movies_in_tamil_free.pdfIn PDF document text
    • https://s3.amazonaws.com/jadudusujuje/audi_a4_avant_2017_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/godewumazek/lovikuxu.pdfIn PDF document text
    • https://s3.amazonaws.com/wipotegadodorek/crossword_answer_for_distinguished_or_famous.pdfIn PDF document text
    • https://s3.amazonaws.com/fedojigudaj/grade_4_symmetry_worksheets.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d369.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD369 5248 bytes
SHA-256: ed7ddfd42336c1f9f692fb4389f05722871b3c8645ca4eceae8695ba3da58ff6
font_01_sfnt_off0000e54e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE54E 10808 bytes
SHA-256: f1bf88e3cef52d877a6cd288cd27777109af0b33f68ff161c2c7732d2d1b3f2a
font_02_sfnt_off00010a81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A81 16064 bytes
SHA-256: 8ce0575abc6f686af3c1393089841c21814f5c4838d5adbe0d649219e58da802

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