Malicious PDF — malware analysis report

Static analysis result for SHA-256 1dc8c8407a4ec431…

MALICIOUS

PDF

158.3 KB Created: 2021-02-20 07:01:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f7af2164fabb291d829bab88978e3329 SHA-1: b633ed4ae51944e419a5001ec411820251893155 SHA-256: 1dc8c8407a4ec43112ae4bb62440667315f625dbae2259573f8874c2977b14ba
96 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, one of which is `https://leonvi.ru/wix?keyword=microbe+passport+worksheet`. The document body, though heavily obfuscated, suggests a lure related to a 'microbe passport worksheet', likely intended to trick the user into visiting the malicious URL. No scripts were extracted, but the presence of embedded URLs and the high confidence threat detection indicate a phishing or malware distribution attempt.

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://leonvi.ru/wix?keyword=microbe+passport+worksheet
    • http://kleomaften.online/the_shape_of_things_to_come_ramones_lyricsanzox.pdf
    • http://detonic-ufficiale.website/what_should_the_picture_settings_be_on_a_vizio_tvwulcx.pdf
    • https://cdn.sqhk.co/jebanufebejo/gjdL675/kulolobojizu.pdf
    • https://vosilidasum.weebly.com/uploads/1/3/2/7/132740263/jutexiferotadovig.pdf
    • http://xiwotafajiloluf.22web.org/wixorekojojig.pdf
    • https://cdn.sqhk.co/fovipobex/fjg3rjP/freepik_heart_icon.pdf
    • https://cdn.sqhk.co/kitujesijak/gijfjhL/10180625547.pdf
    • https://static.s123-cdn-static.com/uploads/4450884/normal_5ffef81c9ec69.pdf
    • https://static.s123-cdn-static.com/uploads/4366627/normal_6007bb9ac4a46.pdf
    • https://cdn-cms.f-static.net/uploads/4382209/normal_602ab6eae85c8.pdf
    • https://cdn-cms.f-static.net/uploads/4464297/normal_602965440df04.pdf
    • http://strita.space/emulator_gameboy_advance_androidrse3o.pdf
    • https://zademufexek.weebly.com/uploads/1/3/4/7/134765537/wesodakejizuri.pdf
    • https://static.s123-cdn-static.com/uploads/4377371/normal_5fe2317517b70.pdf
    • http://letgtma.bid/yosemite_iso_torrent.zipfv3t8.pdf
    • https://sokuvefababadax.weebly.com/uploads/1/3/1/8/131856373/juvolejaju.pdf
    • https://cdn-cms.f-static.net/uploads/4382621/normal_6021cc3cd0fe0.pdf
    • http://prazdnikprosto.ru/balapam_patti_telugu_songmelh8.pdf
    • https://cdn.sqhk.co/ligumorik/hghd9Wp/best_color_ballpoint_pens.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://kivunakoxowufaf.epizy.com/34794594549.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_off000234b4.bin
d71a4f1ab1544d5ea5444bb190dee152d3b1a88db13eb7666621efbce025ea70
pdf-font-stream PDF embedded font (sfnt) at offset 0x234B4 5288 bytes
font_01_sfnt_off000246c6.bin
355145ceee9f21a9930f2e859f95bc3bb815956d99e1683f3ede8deaa03c4ced
pdf-font-stream PDF embedded font (sfnt) at offset 0x246C6 10628 bytes