Malicious PDF — malware analysis report

Static analysis result for SHA-256 9959a39d5d161cbb…

MALICIOUS

PDF

77.8 KB Created: 2021-03-29 00:08:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 0de80826b42b4d24bc980b3b28f38d84 SHA-1: ef3a522a29374fbabefbef9dbac2f6b0e35b97e9 SHA-256: 9959a39d5d161cbbcb9691d342238501b7d2ca9f4b9cd9782e3f98380faacb19
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://dugedepap.ru/strik?utm_term=tipers+physics+solutions+pdf PDF link annotation
    • http://dejawozap.iblogger.org/81686475410.pdfIn PDF document text
    • http://tulakijumipad.22web.org/desarrolla_tu_cerebro_libro.pdfIn PDF document text
    • http://lusaxesa.iblogger.org/pollination_and_fertilization.pdfIn PDF document text
    • https://nefarixutasirov.weebly.com/uploads/1/3/1/6/131606035/xakesunomurokejasa.pdfIn PDF document text
    • https://radimedogotisig.weebly.com/uploads/1/3/0/9/130969281/5fce93a894a08da.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/ditiruz/archer_c1200_firmware.pdfIn PDF document text
    • https://s3.amazonaws.com/risisipajole/94734649544.pdfIn PDF document text
    • https://s3.amazonaws.com/subopukomanaw/livro_a_divina_comedia_dante_alighieri.pdfIn PDF document text
    • http://rosiwik.epizy.com/nepuxob.pdfIn PDF document text
    • http://gonapubofolok.epizy.com/lapulavemijukomolonimilux.pdfIn PDF document text
    • http://wivirimudip.epizy.com/thug_motivation_101_free_download_mp3.pdfIn PDF document text
    • http://tizifeb.rf.gd/sentence_word_order.pdfIn PDF document text
    • http://nibijebe.epizy.com/7251198283.pdfIn PDF document text
    • http://dazozelagur.epizy.com/nujagetura.pdfIn PDF document text
    • https://s3.amazonaws.com/zidosozawok/occult_bacteremia_guideline.pdfIn PDF document text
    • http://gumajixu.rf.gd/57123605980.pdfIn PDF document text
    • http://xidatozekef.epizy.com/68144833020.pdfIn PDF document text
    • http://fajukopifajip.rf.gd/fajezabadijinovozoxe.pdfIn PDF document text
    • http://jozuwim.epizy.com/3733193296.pdfIn PDF document text
    • https://s3.amazonaws.com/xijilesuzuxo/agneepath_song_wapking.pdfIn PDF document text
    • http://vutagoviwimet.rf.gd/tuberculosis_cenetec.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f2cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2CF 5084 bytes
SHA-256: f00e4a1f0524d57934097b4cdcb793ad87d8efbef6b44d29b48a0090e79625d2
font_01_sfnt_off00010423.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10423 11148 bytes
SHA-256: 9b6c797ea2135bf1d0f6a81abe2bdd8bdf20ce8165fb692407f56d243a24d059

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