Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3d73559c473dca9…

MALICIOUS

PDF

84.4 KB Created: 2021-03-20 05:51:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 11ebc6e13ddd94bcc36101503af76636 SHA-1: 2e428ecd6c9c459dbaac6eb80a14f4c03202d19d SHA-256: a3d73559c473dca9022b30f98a531e82e5e5896e05d15a55653c3e47666784bc
96 Risk Score

Malware Insights

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

The PDF document contains embedded URLs and the document body suggests a lure related to 'The chaser short story questions'. The primary malicious URL, https://midufefew.ru/wix?keyword=the+chaser+short+story+questions, was flagged by heuristics and is likely used to deliver a secondary payload or conduct phishing. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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://midufefew.ru/wix?keyword=the+chaser+short+story+questions
    • https://cdn-cms.f-static.net/uploads/4408336/normal_60245fed20270.pdf
    • https://cdn.sqhk.co/zotenejek/ieibcy7/48955599584.pdf
    • https://cdn.sqhk.co/nejibija/giigehd/doguzufuvefezujorafube.pdf
    • https://cdn-cms.f-static.net/uploads/4470035/normal_600d520a7d44e.pdf
    • https://cdn.sqhk.co/goduwonon/eihKhaa/23590555235.pdf
    • https://cdn-cms.f-static.net/uploads/4447467/normal_60320f0460319.pdf
    • https://cdn.sqhk.co/jivomawufem/eiatqgc/75823410497.pdf
    • https://static.s123-cdn-static.com/uploads/4483586/normal_5fdebfbd83c4b.pdf
    • https://cdn.sqhk.co/gogojiranat/h4ideVS/jiripaxopivef.pdf
    • http://dijawobal.iblogger.org/gadaruf.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/tawosutosuxi/8528270904.pdf
    • http://fozovevozasox.epizy.com/48875219053.pdf
    • https://c33c3ce4-fa2f-4f19-9477-7a801b41b29e.filesusr.com/ugd/ebbcbd_ba8d735b9ccb4086b1b521e5efd5d6f6.pdf?index=true
    • http://lekirajadu.epizy.com/sony_xplod_1000_watt_amp_xm-1652z_rms.pdf
    • https://528a8416-53f4-4693-bcf0-540471887af1.filesusr.com/ugd/c3aa89_14b1dc10377b46ccb98f249bbc74ae1f.pdf?index=true
    • http://fogalefudomuj.epizy.com/arrange_page_online.pdf
    • http://sudolurimav.epizy.com/gba_emulator_apk_here.pdf
    • https://201a0bc5-0eb3-4135-8969-828875a6b07d.filesusr.com/ugd/607883_fe4986fbe0f04c198150f6ea10389770.pdf?index=true
    • http://rilevajikilesew.epizy.com/librecad_3d_free_download.pdf
    • https://s3.amazonaws.com/dorulusof/tuvenofezidix.pdf
    • https://e22e8d81-f41f-4d51-abb1-39b19d2d32bb.filesusr.com/ugd/96bf9d_4a0694b8f5704d348fc0269633643d66.pdf?index=true
    • http://foweroboxufafuv.epizy.com/lanew.pdf
    • http://fositelorefux.epizy.com/vaxepinaloligovefer.pdf
    • http://vokerajud.epizy.com/scotsman_guide_top_originators_2018.pdf
    • http://riwexakax.epizy.com/nizatunape.pdf
    • https://s3.amazonaws.com/jukoxisojow/sony_android_adb_interface_driver_windows_10.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_off0001000b.bin
007d3090b64a221f898ec5125c673cf099b68f91ebe31e0d5ff0adebc27daa6b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1000B 4916 bytes
font_01_sfnt_off000110bc.bin
a62a90da008d1245ce4674b7bc4d25e2f90008c494a9571e01d8c7df536ef3bf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x110BC 10748 bytes
font_02_sfnt_off0001357e.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1357E 4324 bytes

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