Malicious PDF — malware analysis report

Static analysis result for SHA-256 174b3adc45de2db2…

MALICIOUS

PDF

71.2 KB Created: 2021-03-16 10:24:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1f7c19845a7f3506d8ff747d3cd99e47 SHA-1: b7fff0b2892c2b38def5a05bda9a4a3d27b4f239 SHA-256: 174b3adc45de2db2974aceaa5dcc004a9242af8b487beb64a1a978138d13b4de
96 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with the primary one being `https://jumiwimov.ru/wix?keyword=holt+mcdougal+literature+grade+8+answer+key+pdf`. This URL, combined with the document's content suggesting an 'answer key', indicates a phishing or social engineering attempt to trick the user into downloading further malicious content. The ClamAV detection and ML classifier strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://jumiwimov.ru/wix?keyword=holt+mcdougal+literature+grade+8+answer+key+pdf
    • http://muslims.net/zodejasuvopelonuweb9gqy.pdf
    • https://pudeputuxokaj.weebly.com/uploads/1/3/5/9/135968230/lunuguwus.pdf
    • http://kuvenumine.mygamesonline.org/skyrim_how_to_use_loot_with_nexus_mod_manager.pdf
    • http://want-seo.ru/2016_ap_environmental_science_frq_answersjuq5o.pdf
    • http://jekenufakewe.mypressonline.com/rukubelumepinobisod.pdf
    • https://cdn-cms.f-static.net/uploads/4499673/normal_5fe9886f2f5c2.pdf
    • http://mnclassis.org/27796534261y5qrk.pdf
    • https://cdn-cms.f-static.net/uploads/4448096/normal_5fd0ac108d0ad.pdf
    • https://static.s123-cdn-static.com/uploads/4402504/normal_5feb0c6129f9b.pdf
    • http://beststudent.fun/how_to_play_games_on_a_ti-34_multiview_calculatoro04ss.pdf
    • http://rasazajafatirek.mypressonline.com/how_to_write_a_movie_pitch_examples.pdf
    • http://raisinshub.pro/7996348425ii77g.pdf
    • https://welajewovire.weebly.com/uploads/1/3/3/9/133999455/0043d8615.pdf
    • http://tdsevsvet.ru/61298410740ryvpj.pdf
    • https://lodikesilir.weebly.com/uploads/1/3/4/8/134868057/7934831.pdf
    • https://monaxakapivelor.weebly.com/uploads/1/3/1/1/131164425/5020204.pdf
    • http://hrushch.space/texujot4ke8.pdf
    • http://ukranews.icu/vampire_null_5e_statsinwd3.pdf
    • http://clipshd.design/toripamedusb85b.pdf
    • https://zazafiwizodizi.weebly.com/uploads/1/3/4/0/134041258/1cf39b2b0.pdf
    • https://cdn-cms.f-static.net/uploads/4388626/normal_6029964aa44e6.pdf
    • http://wumewil.sportsontheweb.net/nomovelivubiwevala.pdf
    • http://likefetevu.getenjoyment.net/applications_of_biotechnology_class_12_ncert.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://wulibazosuxib.onlinewebshop.net/skewed_t_distribution.pdf
    • http://pidodexogejax.myartsonline.com/71491718157.pdf
    • http://nisetekotixob.myartsonline.com/51055060874.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_off0000d741.bin
6c0a8f630aecc3e008ba4272ca2bb944893b7af43363fc9697934ae447c1590f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD741 5888 bytes
font_01_sfnt_off0000eb4b.bin
1c703b7eb48d13353eea4035382958005c1a759f3d8d2d85a18c7e69dce9b4d9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB4B 10436 bytes

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