Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ca2404ccf17a1fb…

MALICIOUS

PDF

72.5 KB Created: 2021-04-04 19:00:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: deff6b29e7a6c872202f3aa25b4caf30 SHA-1: 2f8627ffd57a680e846809095b4123f38394da00 SHA-256: 1ca2404ccf17a1fb10fee5b99a229fb93367525ea5b9fc6b6071e37dd6458a97
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm designed to direct users to potentially malicious websites. The ML_NYX_PDF_MALICIOUS and ClamAV detections further support its malicious nature. The embedded URLs are likely used to host phishing content or distribute further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://soxebez.ru/aws?utm_term=step+12+na+it+works+how+and+why
    • https://jixejuterekafiw.weebly.com/uploads/1/3/4/5/134508928/2164aff23a504.pdf
    • https://cdn.sqhk.co/kuzaxepigi/hamgdhb/luwafuzowavakerugu.pdf
    • https://cdn.sqhk.co/xokebuzizo/hihGjjH/xurul.pdf
    • https://zuxidonav.weebly.com/uploads/1/3/4/8/134867872/1141166.pdf
    • https://gewewipuno.weebly.com/uploads/1/3/0/7/130775766/gixijulegaxifani.pdf
    • https://bunupujitoj.weebly.com/uploads/1/3/4/0/134017728/dugenakumimil.pdf
    • https://cdn.sqhk.co/wezupobuwab/ibifjbF/sonic_boom_cartoon_network_2014.pdf
    • http://vowufijetapiko.sportsontheweb.net/32038797058.pdf
    • https://cdn.sqhk.co/zofizitene/ja0nIjh/285166180.pdf
    • https://cdn.sqhk.co/detatakev/ieianOZ/1427850512.pdf
    • http://gavowobow.iblogger.org/bunebobogixolilidunuvig.pdf
    • http://jotitojimo.mygamesonline.org/69236283460.pdf
    • https://nutagabe.weebly.com/uploads/1/3/5/3/135325028/5a6f9b8e.pdf
    • http://libopadu.scienceontheweb.net/per_la_gloria_d_adorarvi.pdf
    • https://cdn.sqhk.co/getabemuto/haZihge/14663250826.pdf
    • http://xasumemazekejo.scienceontheweb.net/adding_fractions_and_mixed_numbers.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://mafokesa.onlinewebshop.net/amina_al_mufti_book_somali.pdf
    • http://tebaputazaxuva.myartsonline.com/bexakagerabilugok.pdf
    • http://gojopowijevefon.epizy.com/eduardo_galeano_english.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_off0000dd43.bin
f27e90fef27c8e99816fe9a2283c75e3216a7813a2d4bc5ebee018ad52ddb707
pdf-font-stream PDF embedded font (sfnt) at offset 0xDD43 5560 bytes
font_01_sfnt_off0000f04a.bin
3f8b8cab1a7e77e52f3f8074a60d11a9310da3c03500b8a4311d17e46180565b
pdf-font-stream PDF embedded font (sfnt) at offset 0xF04A 10804 bytes