Malicious PDF — malware analysis report

Static analysis result for SHA-256 46037885385c13f9…

MALICIOUS

PDF

71.6 KB Created: 2021-04-26 20:12:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a463b32799188dc502bc0ae51c9fa606 SHA-1: d0b471b4c449a1655219717a1a4a7461e432b48c SHA-256: 46037885385c13f9f8b17991b82fa825285366651453ce21fb106fbf09713355
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 a machine learning classifier indicated a high probability of maliciousness. An external URI pointing to 'jacksth.ru' was extracted, suggesting a phishing or malware distribution attempt. The document body, though truncated and obfuscated, contains metadata related to 'wkhtmltopdf' and a date, but no clear textual lure. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://jacksth.ru/strik?utm_term=seedfolks+book+trailer
    • https://junimadegerozo.weebly.com/uploads/1/3/4/0/134096607/53950a5434e813f.pdf
    • http://zotusomadelisok.22web.org/spotify_premium_hack_ios_11.pdf
    • https://cdn-cms.f-static.net/uploads/4494674/normal_6011f8a9a3f2a.pdf
    • https://static.s123-cdn-static.com/uploads/4408195/normal_5fed4a0198436.pdf
    • https://cdn-cms.f-static.net/uploads/4471474/normal_60551e086c7e0.pdf
    • https://cdn-cms.f-static.net/uploads/4381737/normal_5fdc4477379c7.pdf
    • https://cdn-cms.f-static.net/uploads/4421478/normal_6027e5fcef456.pdf
    • https://nunipotewisi.weebly.com/uploads/1/3/4/8/134892443/wokegukarosabu.pdf
    • https://static.s123-cdn-static.com/uploads/4462694/normal_5feb71ef4afe4.pdf
    • https://cdn-cms.f-static.net/uploads/4464534/normal_603e3cc916ba0.pdf
    • http://rizaxezo.iblogger.org/asus_rt-ac87u_5ghz_not_working.pdf
    • https://gerogebu.weebly.com/uploads/1/3/1/6/131637886/9122182.pdf
    • https://cdn-cms.f-static.net/uploads/4389095/normal_60618a739ac96.pdf
    • https://cdn-cms.f-static.net/uploads/4418783/normal_60570c421b95a.pdf
    • http://suxiselukex.66ghz.com/407418429.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/jemisajoda/nekatobodu.pdf
    • https://s3.amazonaws.com/suximawo/xamarin_forms_navigation_page_bar_color.pdf
    • http://sitegimama.rf.gd/sololapu.pdf
    • http://sopuvezek.rf.gd/actisense_w2k-_1_manual.pdf
    • https://s3.amazonaws.com/rubidokezive/national_human_trafficking_hotline_canada.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_off0000ceef.bin
f6c8e0b53d8685a6f8500ae8b04cb8ddf4732afe1555f2d558dcf9db0f3f0561
pdf-font-stream PDF embedded font (sfnt) at offset 0xCEEF 4888 bytes
font_01_sfnt_off0000df9a.bin
e7bc5a49421d8ea0fa2d28a7b458872aca35f0aff2b0554f8fab19525e35c2c0
pdf-font-stream PDF embedded font (sfnt) at offset 0xDF9A 10052 bytes
font_02_sfnt_off0001020e.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176
pdf-font-stream PDF embedded font (sfnt) at offset 0x1020E 4324 bytes