Malicious PDF — malware analysis report

Static analysis result for SHA-256 fed4d30dae5a8246…

MALICIOUS

PDF

75.4 KB Created: 2021-03-26 06:42:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a4d157d35cb8a264c1d25284d6a4633e SHA-1: 18798286c437dda40c542bf1c4be027dcbe4c3e4 SHA-256: fed4d30dae5a82464a60d6a73060ea7f4b1158e58b3e859cba63fd7615ac6948
96 Risk Score

Malware Insights

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

The file is a PDF document that contains a URL disguised as an answer key for word problems. The embedded URL, https://nipisod.ru/strik?utm_term=system+of+inequalities+word+problems+answer+key, is highly suspicious and likely leads to a phishing or malware distribution site. ClamAV detection further supports its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://nipisod.ru/strik?utm_term=system+of+inequalities+word+problems+answer+key
    • https://cdn.sqhk.co/dedesonor/bhdEggx/xosegisufowifoledaluzup.pdf
    • https://cdn.sqhk.co/wolebiduju/2uUijic/my_boy_free_gba_emulator_download_apk.pdf
    • https://vodemilofokuse.weebly.com/uploads/1/3/4/2/134235674/eb38b3f.pdf
    • https://debinezituxi.weebly.com/uploads/1/3/4/3/134339783/f8b1d.pdf
    • https://cdn.sqhk.co/konidadelan/P3ha1hf/xoxexo.pdf
    • https://bexopugizabon.weebly.com/uploads/1/3/4/0/134042324/solivabolo.pdf
    • https://cdn.sqhk.co/kesavaki/jhgkjcu/91150211112.pdf
    • https://cdn.sqhk.co/wufevinek/p1TIjjG/ice_cream._places_open_late.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/xubifupi/classic_wow_rogue_poison_guide.pdf
    • http://reditavipesef.rf.gd/android_tv_box_x10_4k.pdf
    • https://uploads.strikinglycdn.com/files/0734e41e-0d60-420a-9974-c629d8c5aedb/417_response_code.pdf
    • https://uploads.strikinglycdn.com/files/c1930e95-c7b9-4e3c-add2-6cd7180af2dc/parexirosagokuxaro.pdf
    • https://s3.amazonaws.com/ganubifirigevi/9522882258.pdf
    • http://tefesapebeto.rf.gd/grade_12_chemistry_textbook_nelson.pdf
    • https://b01ec662-dec5-4f54-b977-8708717d6054.filesusr.com/ugd/07e02c_fec585e0455340b9b006c113f4535142.pdf?index=true
    • https://uploads.strikinglycdn.com/files/fcfe62cd-48af-4d43-b7ab-bd234d2d4f2e/how_to_clean_magnum_x7_paint_sprayer.pdf
    • http://wotisonuli.epizy.com/rakuzapesufitugos.pdf
    • http://toralixeg.rf.gd/2nd_conditional_exercises_with_answers.pdf
    • https://c4e42e93-254c-4ba8-b495-737f84002742.filesusr.com/ugd/ddb60a_b92dd9a9f2c24a8ab60852cce9fafaed.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_off0000e4d3.bin
bc95c7fb56501e4543dd98ba0736d505c03ef0d8af4fd43bb40e582c0d0c8e23
pdf-font-stream PDF embedded font (sfnt) at offset 0xE4D3 5812 bytes
font_01_sfnt_off0000f89a.bin
ffda2ca0c69220808a2d3e55e35b343f6ea034b0985d86c99453ab302ff1ef8a
pdf-font-stream PDF embedded font (sfnt) at offset 0xF89A 11628 bytes