Malicious PDF — malware analysis report

Static analysis result for SHA-256 3966ff6ff80a4fe1…

MALICIOUS

PDF

76.9 KB Created: 2021-05-10 14:23:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f51f10b7d07bd21e7cbfb220a8041b3b SHA-1: d27bdc8c868eee98f5af9ba4f6c4d4e26be50b13 SHA-256: 3966ff6ff80a4fe1585268cd84949d98f383ffc9021987b06893d7593b0b845d
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 an embedded URL that leads to a suspicious domain, likely intended to host a malicious payload or phishing page. The document body, though heavily obfuscated, suggests a lure related to 'making a sad person happy over text', which is a common tactic for phishing or social engineering.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://dafemum.ru/strik?utm_term=how+to+make+a+sad+person+happy+over+text
    • https://cdn-cms.f-static.net/uploads/4478927/normal_6048f4a53c076.pdf
    • http://hookup681.site/fugikutozadudevalakm4s1.pdf
    • https://cdn-cms.f-static.net/uploads/4447079/normal_603e6503d16b4.pdf
    • https://static.s123-cdn-static.com/uploads/4370764/normal_5fde2db6237a6.pdf
    • http://buxewufa.iblogger.org/62751147928.pdf
    • http://uablog.website/hp_stream_11-d010wm_specscl6jr.pdf
    • https://cdn.sqhk.co/gituridewo/hhzjaha/95810797739.pdf
    • http://xuritepizib.mygamesonline.org/act_utilitarianism_vs_rule_utilitarianism.pdf
    • http://baxusajatos.sportsontheweb.net/cocubes_aptitude_questions.pdf
    • https://cdn.sqhk.co/gazamara/b8jesqu/72016517487.pdf
    • https://cdn.sqhk.co/sozodumupof/iiia7if/drum_machine_app_iphone_free.pdf
    • https://static.s123-cdn-static.com/uploads/4488580/normal_5ff5d64c30f73.pdf
    • http://tepoparupomo.medianewsonline.com/thinking_out_loud_piano_sheet_music.pdf
    • http://eurozone.pro/660576619279ku1b.pdf
    • http://kikababono.mywebcommunity.org/10837181907.pdf
    • https://cdn.sqhk.co/jebumujo/PLjhk90/61811467021.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://kafopazam.epizy.com/haareya_song_lyrics.pdf
    • http://dikewovob.epizy.com/tosavixirujizedaru.pdf
    • http://xanawuvogi.epizy.com/voxudojiv.pdf
    • https://d71fc03c-aea6-48f7-a990-8afffb22108d.filesusr.com/ugd/3de8a6_98bfdf4bb6164efab880a5b0e27eb3ec.pdf?index=true
    • https://08c3cc13-1ce0-4add-927e-a3aed263473e.filesusr.com/ugd/ccf397_4b7d4d1ca3b8474e9433972b72cb4c10.pdf?index=true
    • http://diremize.epizy.com/how_to_write_a_french_essay_about_yourself.pdf
    • https://ef733714-782c-48ea-8991-1bc0bf0c95f2.filesusr.com/ugd/ad2ade_9c89bc53dfa94443aabf5bc3cd601ff2.pdf?index=true
    • 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_off0000ef49.bin
c224c4fd85783d116b6b879a681bcaaf25c8ee0d085251db4811b6e2fd9d8fc0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF49 5516 bytes
font_01_sfnt_off000101f6.bin
447beb95add387a5aede9069317e3dd2895d47b4fb8e7eca5c2e8a3d46ceafee		 pdf-font-stream PDF embedded font (sfnt) at offset 0x101F6 10656 bytes

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