Malicious PDF — malware analysis report

Static analysis result for SHA-256 b76bf50f4e91d332…

MALICIOUS

PDF

68.0 KB Created: 2020-12-14 22:32:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0e279e668505fa6306da4e004c378c23 SHA-1: d0fd82ea9c5c01101db8f80430d9c9e72c27f441 SHA-256: b76bf50f4e91d332ce21462026ee5f6d60de072d603a55fda8b34a4d64ad82e5
96 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains an embedded URL pointing to 'traffset.ru', which is likely used to host a malicious payload or redirect the user to a phishing site. The document body, though heavily obfuscated, contains text related to 'Van der waals constants', 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-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://traffset.ru/123?utm_term=van+der+waals+constants
    • https://cdn-cms.f-static.net/uploads/4366032/normal_5f87b09664b82.pdf
    • https://cdn-cms.f-static.net/uploads/4487623/normal_5faa3cee88efb.pdf
    • https://static.s123-cdn-static.com/uploads/4426271/normal_5fc619d015a5f.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/daff3a97-ffeb-4230-82ef-92bab7e57efc/bulonitamukit.pdf
    • https://uploads.strikinglycdn.com/files/2bfef3eb-e8fd-451f-bb67-ea73da3c5143/81804174538.pdf
    • https://uploads.strikinglycdn.com/files/e1af62da-4b75-45ac-8455-3ac1263ea7b9/dakivupukepafi.pdf
    • https://s3.amazonaws.com/lewuli/yorkies_for_adoption_in_texas.pdf
    • https://static1.squarespace.com/static/5fbfdb415687f52b6b7b2913/t/5fc12a68e18c5c478e25caf3/1606494825895/fexazakifo.pdf
    • https://static1.squarespace.com/static/5fc109f45e8e827d428e9438/t/5fc834e07ff5a343ebecb871/1606956257681/58473958602.pdf
    • https://static1.squarespace.com/static/5fcecc3225f96d1b32d21edb/t/5fd60106ab777271768496a2/1607860488609/xolegazojagusutof.pdf
    • https://static1.squarespace.com/static/5fc4ce616609fd0ee7aa78df/t/5fc5c9ab4f98375720a77c66/1606797744767/accounting_chapter_3_test_answers.pdf
    • https://uploads.strikinglycdn.com/files/6b8b4b77-022e-4102-8c08-13a293406125/kizasovil.pdf
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbd070e45ca4f79026776aa/1606223631605/still_life_powerpoint.pdf
    • https://static1.squarespace.com/static/5fc5768fc6229360eccbb460/t/5fc99ad287b36f46d4f90c2d/1607047890962/commander_legends_spoilers_mtg_amino.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ca86.bin
9819f9395b8f308ff027696a52ce2ce0ba3c6f85132c975ee6dc1d80af80ea13
pdf-font-stream PDF embedded font (sfnt) at offset 0xCA86 4988 bytes
font_01_sfnt_off0000dba0.bin
0f674bc96a4c8a8a482a58219a7208e6c930b201eb17a76bc320a11828395586
pdf-font-stream PDF embedded font (sfnt) at offset 0xDBA0 11656 bytes