Malicious PDF — malware analysis report

Static analysis result for SHA-256 70ef3a6203b45c26…

MALICIOUS

PDF

77.3 KB Created: 2021-03-29 20:25:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7616c686d7a36e8ab19ba95572f40587 SHA-1: 9af0e8c38bbf92228200a0c572142d5c373e1971 SHA-256: 70ef3a6203b45c26d9e8404e52bd0d3da549fe33544dbd28bea9c6a110fb8c42
96 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated a high probability of maliciousness. It contains an external URI pointing to a suspicious domain, likely intended to trick users into downloading further malware disguised as educational content. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and a date, suggesting it was generated programmatically to appear as a legitimate document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://botokaw.ru/award?keyword=10th+class+maths+textbook+pdf+download
    • http://strita.space/present_cm_and_governor_of_all_states_in_indianp339.pdf
    • https://static.s123-cdn-static.com/uploads/4390680/normal_5fdda8072a912.pdf
    • http://bigpleasure.ru/sidesuwunossw23c.pdf
    • https://cdn.sqhk.co/batovafakupo/hfw99yC/android_emulator_10._0._0._2.pdf
    • http://cleaner360.shop/5893982916272icv.pdf
    • https://cdn.sqhk.co/falupuvevore/nMikS2a/renamisugavak.pdf
    • http://activa-fb.com/55560532420a2ycn.pdf
    • http://rubivof.22web.org/alimentos_altos_en_calcio.pdf
    • https://cdn.sqhk.co/purijiralug/jtUWii5/wizajano.pdf
    • https://cdn.sqhk.co/gifalaminika/eKgdidx/streaming_music_playlist.pdf
    • http://lakuberik.mywebcommunity.org/degisi.pdf
    • https://cdn-cms.f-static.net/uploads/4382405/normal_604d7a8cd45bb.pdf
    • https://cdn.sqhk.co/soxuvezosapa/hhicHr2/can_you_hand_write_notes_on_ipad.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/ccf37030-32c1-44b5-a6d2-6a80ce08b645/what_were_the_native_american_beliefs.pdf
    • http://dolanuvusipegu.myartsonline.com/surviving_sepsis_guidelines_summary.pdf
    • http://xafotibelazes.rf.gd/vapudususo.pdf
    • http://xetupukofomapi.rf.gd/41081902357.pdf
    • https://uploads.strikinglycdn.com/files/08403a13-dfa2-4600-a60a-019643a5ac49/algebra_1_quadratic_formula_worksheet.pdf
    • http://tamedigozetot.epizy.com/78477466426.pdf
    • http://fumojaw.epizy.com/gingerbread_house_templates_taste_of_home.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_off0000e208.bin
7529f1eed8c38278ea2afa3bdcf5ab616fc04634070c0b53c2a970e0eb7dbd91
pdf-font-stream PDF embedded font (sfnt) at offset 0xE208 5500 bytes
font_01_sfnt_off0000f4a8.bin
1537346ee4971907d7dddb4f3adb95263160466e18a0d4e4e52a8cc0a4d80a9f
pdf-font-stream PDF embedded font (sfnt) at offset 0xF4A8 10948 bytes
font_02_sfnt_off000119be.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3
pdf-font-stream PDF embedded font (sfnt) at offset 0x119BE 4324 bytes