Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac013d3accb6a6aa…

MALICIOUS

PDF

91.7 KB Created: 2021-03-16 21:31:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b3c91e0d99bc5729aab5d0347196f031 SHA-1: e00ebf3fd4484d90d42f35664b9c519580e0017a SHA-256: ac013d3accb6a6aa52d0662292fdd864794774ab48518f4f779a48dd839128e3
96 Risk Score

Malware Insights

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

The file is a PDF document flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URL pointing to 'zajinet.ru', which is a strong indicator of a phishing or malware distribution attempt. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the presence of the external URL is the primary indicator of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://zajinet.ru/strik?utm_term=king%2527s+quest+4+troll
    • https://cdn.sqhk.co/nobixapo/WoUNwja/62952763184.pdf
    • https://cdn-cms.f-static.net/uploads/4390092/normal_6039b826f2aa0.pdf
    • https://cdn-cms.f-static.net/uploads/4381294/normal_601dc172d75b1.pdf
    • https://cdn.sqhk.co/pifonode/Lhdvjgl/brain_it_on_hint_level_40.pdf
    • https://cdn.sqhk.co/vilubofi/SSgg4zK/kenujoxivalon.pdf
    • http://natlab.ru/lease_agreement_without_rent_format628jv.pdf
    • http://befigter.xyz/zaxupekudegide2ot7q.pdf
    • https://static.s123-cdn-static.com/uploads/4388420/normal_5ffac856dbfec.pdf
    • http://bluebadgeapproval.com/the_canterville_ghost_summary_chapter_5dqdjh.pdf
    • http://idealicaitaly-ufficiale.site/hamlet_act_2_scene_1_summary_shortjuo6q.pdf
    • https://cdn-cms.f-static.net/uploads/4380869/normal_60397e97a2135.pdf
    • https://cdn-cms.f-static.net/uploads/4389804/normal_6049173df23e6.pdf
    • https://cdn.sqhk.co/ledodatefu/BHlWjiq/17944466498.pdf
    • https://cdn.sqhk.co/kuderoxuz/jQheKHH/bloons_td_5_free_download_pc.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://6c8027e1-9878-41b3-a9ef-32ba2b6bcd02.filesusr.com/ugd/185811_686c7acadcbc456d927e506cfa26f641.pdf?index=true
    • https://s3.amazonaws.com/xupovobejanam/94274296527.pdf
    • https://983c8978-ad56-435f-a988-47358aa6040c.filesusr.com/ugd/06a663_69fb048f35104e40bfb0955f84dc46b0.pdf?index=true
    • https://s3.amazonaws.com/mafavuzenoliki/23810992736.pdf
    • https://s3.amazonaws.com/wuzalugiseto/panasonic_bread_maker_manual_sd_251.pdf
    • https://e8c82854-2a0b-4c0f-82de-bac600ce06e6.filesusr.com/ugd/d017d5_d933277d55a047b9a4e621378649fc5f.pdf?index=true
    • https://s3.amazonaws.com/gebukil/dometic_ccc2_thermostat.pdf
    • https://s3.amazonaws.com/sepawi/home_medical_alert_systems_consumer_reports.pdf
    • https://010f2e21-25ca-4560-806d-08cbbb7c7db1.filesusr.com/ugd/74a852_a69543bfa82d4d79a2370d9cfa972399.pdf?index=true
    • https://s3.amazonaws.com/rufonali/performance_appraisal_meaning_in_accounting.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_off00011fe5.bin
694a8eb4ffb64a480feb44445d0b42f5e8d0793f32dadc8ac296781be6dfae4c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11FE5 4744 bytes
font_01_sfnt_off0001301f.bin
aa216c25f239944a68180a1e151abe5794756d724d5848b15ec06e9cc0060c18		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1301F 10180 bytes
font_02_sfnt_off000152dc.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x152DC 4324 bytes

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