Malicious PDF — malware analysis report

Static analysis result for SHA-256 a023979a9317c209…

MALICIOUS

PDF

77.5 KB Created: 2021-06-10 01:40:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 2f4d4b107aa39fb92ddf595bb3713666 SHA-1: 1bd2e2c65d0a26ffa62a92b271e4cc01ca621a13 SHA-256: a023979a9317c20961b7943e69ea19084e844762590bd5a9a6cd61b63f7450b6
186 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 0.9991

Heuristics 6

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://allytemp.ru/pbw?utm_term=convert+srt+to+mp4 PDF link annotation
    • https://revelamedif.weebly.com/uploads/1/3/1/4/131437508/razuvurelates_tulivar.pdfIn PDF document text
    • https://juboxunogaruf.weebly.com/uploads/1/3/4/7/134700559/ragepat.pdfIn PDF document text
    • https://kiwudete.weebly.com/uploads/1/3/7/4/137499522/nugurumuzepafoxu.pdfIn PDF document text
    • https://vaferomesab.weebly.com/uploads/1/3/4/3/134351928/6541733.pdfIn PDF document text
    • https://vowomupow.weebly.com/uploads/1/3/4/8/134846305/vifefamaz-wazogoz-karax.pdfIn PDF document text
    • https://gazezujebek.weebly.com/uploads/1/3/4/8/134881616/88889.pdfIn PDF document text
    • https://kegazesawatodo.weebly.com/uploads/1/3/4/3/134378031/pakomerupokos-gegukusesofini.pdfIn PDF document text
    • https://kazowotamije.weebly.com/uploads/1/3/4/0/134012594/e66558216.pdfIn PDF document text
    • https://netavobedeve.weebly.com/uploads/1/3/0/7/130775758/3445607.pdfIn PDF document text
    • https://sifameduj.weebly.com/uploads/1/3/4/5/134522790/1720014.pdfIn PDF document text
    • https://lolejubabam.weebly.com/uploads/1/3/1/3/131379737/puvupulaligovof_jitile_sajepitirofop_zurogiwofozarak.pdfIn PDF document text
    • https://nuruvubapifak.weebly.com/uploads/1/3/1/4/131452890/mumogefosunuge.pdfIn PDF document text
    • https://talibixakezadep.weebly.com/uploads/1/3/4/5/134590085/xibexudan_wozuse_rixudive.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sogotobev.pbworks.com/w/file/fetch/144868344/descargar_los_compas_y_el_diamantito_legendario_mega.pdfIn PDF document text
    • http://paditoxef.pbworks.com/f/9.pdfIn PDF document text
    • http://zanopadik.pbworks.com/w/file/fetch/144993564/66953735540.pdfIn PDF document text
    • http://fisukafetif.pbworks.com/w/file/fetch/144643179/bibatoserife.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d12c664d-b55e-43af-8eb8-1f421f6191ca/sirezavi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f4b4c3ed-e408-4703-a2ad-0bd2d1bd4972/tabla_periodica_comision_nacional_de_energia_atomica.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7b80c7cd-90dc-4110-8344-cd1c361493af/64372616049.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/59d116e2-ee63-46a9-9c11-28ebaba4f2de/8122434242.pdfIn PDF document text
    • http://gatasulupu.pbworks.com/f/pifevanukumenezuxoli.pdfIn PDF document text
    • http://zanikofepaj.pbworks.com/w/file/fetch/144715182/86392810745.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e5ac160e-822f-410a-9d82-1775c544584a/air_force_1_mid_white_custom.pdfIn PDF document text
    • http://bezawagiga.pbworks.com/w/file/fetch/144669135/radexijesugevatup.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_off0000ee47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE47 4776 bytes
SHA-256: dc42e5299df987632784f00562a326bb2274fc88a4a96278940439aac75c55d2
font_01_sfnt_off0000fe77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE77 13520 bytes
SHA-256: b01af05335e91addc4d83826defe75811436d51b7119355cd42565bdc85ca600