Malicious PDF — malware analysis report

Static analysis result for SHA-256 b810f75b2326f428…

MALICIOUS

PDF

70.2 KB Created: 2021-03-18 00:57:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3b782c17bb92c5211dff1a2610eb68f9 SHA-1: ef2d8d45d1ec8ce47c9df06bdf70832fdba2e500 SHA-256: b810f75b2326f4289b21a7f3d85221dde817d4bacfb87dd5690e56eb1100948c
96 Risk Score

Malware Insights

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

The PDF file contains an embedded URL that masquerades as a search result for 'String 1 codingbat answers', likely to trick users into visiting a malicious site. The ML classifier and ClamAV detection strongly indicate malicious intent. No scripts were extracted, but the presence of numerous suspicious URLs suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://ponafet.ru/wix?keyword=string+1+codingbat+answers
    • https://cdn.sqhk.co/ratevusur/ijjdhgu/mofukozesularujuxelarop.pdf
    • https://puzomukasudugun.weebly.com/uploads/1/3/4/8/134865935/ad7a57782.pdf
    • https://cdn.sqhk.co/dibitarebizu/ghdgcge/cytus_2_paff_and_aroma.pdf
    • https://cdn-cms.f-static.net/uploads/4367940/normal_6033297be3093.pdf
    • http://vipadobotisituz.mygamesonline.org/pivirukir.pdf
    • http://ruwemipuwev.mypressonline.com/4815482837.pdf
    • https://cdn.sqhk.co/rujiwujik/gidv0cT/kozimezafob.pdf
    • https://fuvexowigirupog.weebly.com/uploads/1/3/4/8/134896800/2d4fd8b0.pdf
    • http://adminhalil.com/manga_rock_premium_apk_3.7.1lstf8.pdf
    • https://jerupixudenaxi.weebly.com/uploads/1/3/1/4/131437293/kaxuwof.pdf
    • http://kupiokno.su/britax_boulevard_car_seat_instruction_manualwmzu0.pdf
    • http://xutexukoxobofi.mywebcommunity.org/vezixebosevesubiga.pdf
    • http://lishop.site/how_to_adjust_refrigerator_door_height0io7v.pdf
    • http://pelinebaj.mypressonline.com/1948164069.pdf
    • https://tomanudiz.weebly.com/uploads/1/3/1/6/131606325/kitijumifuzikasinaj.pdf
    • https://cdn-cms.f-static.net/uploads/4495409/normal_604fa6c853877.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/sewamos/xumuv.pdf
    • https://s3.amazonaws.com/lekelepowo/aida64_extreme_edition_full.pdf
    • https://s3.amazonaws.com/faxaxos/android_mobile_application_developer_skills.pdf
    • http://lavisekenesavof.myartsonline.com/92079697822.pdf
    • https://s3.amazonaws.com/wifukedot/coleman_powermate_3250_generator_manual.pdf
    • https://s3.amazonaws.com/besafefaf/suzolufi.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_off0000d35f.bin
ec86606ed65c346aaa92f35a186f239ea06bf3371df02b3159042cd348255470
pdf-font-stream PDF embedded font (sfnt) at offset 0xD35F 5460 bytes
font_01_sfnt_off0000e617.bin
e3c1543647f7ec2cb5cd8a104e6d68a61c07604c3d0fc69a6b02435e65e7eee8
pdf-font-stream PDF embedded font (sfnt) at offset 0xE617 10964 bytes