Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e5a86b0c729c810…

MALICIOUS

PDF

74.6 KB Created: 2021-03-01 02:51:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 284019170936908659ae98952c4f8473 SHA-1: 198c061fe4bd8ba23081b8aecafbf0daeac990b6 SHA-256: 5e5a86b0c729c810970eefe47bab9b64871bc56a2c9f8b9b3333b3b040b9401c
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, a common tactic for SEO spam or redirecting users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's designed to exploit users by directing them to potentially harmful content hosted on domains like resalured.ru and weebly.com.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://resalured.ru/strik?utm_term=what%2527s+the+best+way+to+clean+hot+tub+filters
    • https://fisotewefupug.weebly.com/uploads/1/3/1/0/131071176/8919695.pdf
    • https://cdn.sqhk.co/nodujugebi/ITgghi2/527593417.pdf
    • https://cdn.sqhk.co/difanemifal/ih1zic0/cosmos_ink_review.pdf
    • https://cdn.sqhk.co/sevimifogu/TBfahgP/sinhala_mashup_songs_2020_mp3_download.pdf
    • http://pek-24.cc/form_2210_annualized_methodf7jyd.pdf
    • https://cdn.sqhk.co/vumivatuvi/ga3ibgh/emoney_order_tracking.pdf
    • https://cdn.sqhk.co/nuvaratuji/jd1Fhhj/chicken_strawberry_goat_cheese_salad.pdf
    • https://cdn.sqhk.co/xumesapaxoku/jjDjcji/electrical_engineering_calculator_excel.pdf
    • http://dufigep.scienceontheweb.net/nakosafovakadakofapodab.pdf
    • http://kesisofawa.mygamesonline.org/fairbanks__morse_1_1_2_hp_z_engine_parts.pdf
    • https://kevulukopefot.weebly.com/uploads/1/3/1/4/131453006/mipawenelixat.pdf
    • http://jasazotinalol.mygamesonline.org/42489957310.pdf
    • https://cdn.sqhk.co/gawarebadal/cmnX3jf/nuwoxuxub.pdf
    • http://makebugobiwuka.mypressonline.com/tugazonurabikisapilifefim.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/dazinibonofobi/tattoo_on_my_shoulder_song.pdf
    • https://s3.amazonaws.com/wipotegadodorek/46385634855.pdf
    • https://s3.amazonaws.com/wovugi/factorising_quadratic_equations_worksheet.pdf
    • https://s3.amazonaws.com/jaloto/kotlin_android_interview_questions_and_answers.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_off0000e55e.bin
75aad9dbfd2ae07953544bb5de2d1f1d7383cc097449192068954757da3ef1c4
pdf-font-stream PDF embedded font (sfnt) at offset 0xE55E 5348 bytes
font_01_sfnt_off0000f7b1.bin
07d2668cb5c753b5b2ae3d15a8377e8ea6aa5e12a3add80a6b0106eac98b09c7
pdf-font-stream PDF embedded font (sfnt) at offset 0xF7B1 11012 bytes