Malicious PDF — malware analysis report

Static analysis result for SHA-256 792ec81aaa810615…

MALICIOUS

PDF

74.1 KB Created: 2021-06-11 09:47:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 590c52c246fef7dcd084d17d474a33a3 SHA-1: e3d25cd964ebebeba85bd4482107e57c847be27c SHA-256: 792ec81aaa810615a62f835873c2bf05cff4b722af0a5bc767010feffece61cd
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by both ClamAV and an ML classifier. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation scheme. The embedded content, though heavily obfuscated, appears to be part of this redirection strategy, potentially leading to phishing or malware download sites. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://irlanc.ru/pbw?utm_term=attack+on+titan+season+3+voice+actors+english+dub PDF link annotation
    • https://dusemupewujem.weebly.com/uploads/1/3/7/5/137505742/nabanojiwep_serizuzewupax_kidamezipilubu.pdfIn PDF document text
    • https://zesajuletolif.weebly.com/uploads/1/3/0/9/130969916/jepidesi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389074/normal_604d0abbeccb7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372753/normal_604847eb753be.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446289/normal_6042e4b9718e3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455890/normal_6015ae99cf617.pdfIn PDF document text
    • https://xezolemi.weebly.com/uploads/1/3/5/3/135324657/jipajup.pdfIn PDF document text
    • https://kimivatebuxokas.weebly.com/uploads/1/3/4/7/134702804/voniti.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389604/normal_60bb93adb8918.pdfIn PDF document text
    • https://gebejisidimi.weebly.com/uploads/1/3/5/3/135302949/8927132.pdfIn PDF document text
    • https://fedalovojuxunod.weebly.com/uploads/1/3/0/7/130775560/rifuvolilagixuzazuw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417523/normal_60c1e92b16749.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4455183/normal_60b2e063b810b.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4450345/normal_60b3d42eac0d5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380857/normal_6023bf10df4db.pdfIn PDF document text
    • https://zewajala.weebly.com/uploads/1/3/1/3/131398225/d097c9de09b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374372/normal_6057ccb6554e9.pdfIn PDF document text
    • https://ludatigesoz.weebly.com/uploads/1/3/6/0/136050408/tetufovobazabuvibot.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459034/normal_60184b27800cb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://padimagofo.pbworks.com/w/file/fetch/144481011/32120699242.pdfIn PDF document text
    • http://juvudibip.pbworks.com/f/99443948189.pdfIn PDF document text
    • http://lagawiwefe.pbworks.com/w/file/fetch/144682002/what_is_the_difference_between_voltaic_and_electrolytic_cells.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d530.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD530 3168 bytes
SHA-256: 99812194af3ff6756dce1bec84a3bf62938c1e2ab0e5cb7fbacc5594644456c9
font_01_sfnt_off0000e095.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE095 5620 bytes
SHA-256: 1d063dc6ba6609d666a4f1e062d0a6e4176847287a516212c9479afe6dc40331
font_02_sfnt_off0000f3ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3AE 10764 bytes
SHA-256: 83cab5c908cfaac4557066fffe66a5371bbe85fec7279f9aed6985647dac7704