Malicious PDF — malware analysis report

Static analysis result for SHA-256 26a6dcbc789c9837…

MALICIOUS

PDF

75.2 KB Created: 2021-04-02 09:24:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 21df8e8f8904da5c462c9460e481cea5 SHA-1: d802fb95b52b3786071c721236b28f75a1d318ba SHA-256: 26a6dcbc789c9837dfc5bc1a939a110c250377e2b748a8921eba8974435d79bf
96 Risk Score

Malware Insights

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

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains an embedded URI pointing to a suspicious domain, likely intended to redirect the user to a phishing or malware download site. The document body, though heavily obfuscated, suggests a lure related to 'prewriting document' to entice users to click the malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://pelibifir.ru/wix?keyword=what+is+the+purpose+of+a+prewriting+document
    • https://cdn.sqhk.co/kibedutej/wnzjfuK/kixakanulitiwiremevesut.pdf
    • http://bighome.space/819226869782oyo2.pdf
    • http://indital.space/quivalenz_1_norm_2_normcmi2t.pdf
    • https://cdn-cms.f-static.net/uploads/4423145/normal_602996773a0fc.pdf
    • https://static.s123-cdn-static.com/uploads/4378605/normal_5ff7e712aed2d.pdf
    • http://albatros-trans.ru/wagafuvulefovadupg0lmz.pdf
    • https://cdn-cms.f-static.net/uploads/4456667/normal_602f5b023db47.pdf
    • https://rajepejejema.weebly.com/uploads/1/3/4/8/134860913/mejijabaxokozide.pdf
    • https://cdn-cms.f-static.net/uploads/4485699/normal_5fd5f9a83be6f.pdf
    • https://cdn.sqhk.co/dabebasavus/Q6idhgE/major_lazer_light_it_up_mp4_video_download.pdf
    • https://cdn.sqhk.co/dasofuduveje/e1shgPa/lidorepanobiwuj.pdf
    • https://cdn.sqhk.co/begokaxawip/cFfQfic/boxing_star_game_wiki.pdf
    • https://cdn-cms.f-static.net/uploads/4410952/normal_605629c6d5ecc.pdf
    • https://cdn.sqhk.co/zewumabigige/jighifn/82839267000.pdf
    • http://ultra0.space/1668852081dbanq.pdf
    • https://gekaketiba.weebly.com/uploads/1/3/1/4/131455198/4478633.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://nadefivetokilak.rf.gd/51461435236.pdf
    • https://s3.amazonaws.com/bizamesuwepe/jinujakufuwulavafuzaw.pdf
    • https://s3.amazonaws.com/sajatofubote/cowboys_cheerleaders_uniform.pdf
    • http://xonefepuvimami.epizy.com/free_fire_advanced_server_apk_pure.pdf
    • https://s3.amazonaws.com/bivanud/vasari_lives_of_the_artists.pdf
    • https://s3.amazonaws.com/zaxuledo/zawonukozonofuvun.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_off0000e721.bin
1abfefedb34ed1a5d5bfd9f684a77fba3403be078db55031903b11827e5d3515
pdf-font-stream PDF embedded font (sfnt) at offset 0xE721 5640 bytes
font_01_sfnt_off0000fa48.bin
f41125778b78d9d08b0cfaeab0dee369000ce72a92082dbba82efd818aaff36b
pdf-font-stream PDF embedded font (sfnt) at offset 0xFA48 10888 bytes