Malicious PDF — malware analysis report

Static analysis result for SHA-256 95695b4e200f2656…

MALICIOUS

PDF

81.3 KB Created: 2021-06-09 15:16:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 57c3d126d4a9c110b8ec61a4c5b8e1f8 SHA-1: af527363835f4fe96c5674f38b1bd3c39b5d6276 SHA-256: 95695b4e200f2656da34654574023ed00bcc1e944f5b6232e3259ee777350044
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. One of the primary links, 'https://irlanc.ru/pbw?utm_term=cuphead+apk+download+free', indicates a lure for downloading potentially unwanted or malicious software. No scripts were extracted, but the PDF structure itself is used to host and distribute these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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=cuphead+apk+download+free PDF link annotation
    • https://pijagifodila.weebly.com/uploads/1/3/4/3/134308300/3f290e1dd.pdfIn PDF document text
    • https://xurolimusogisuw.weebly.com/uploads/1/3/4/3/134395808/jonido.pdfIn PDF document text
    • https://safamitiwifiro.weebly.com/uploads/1/3/0/7/130739579/9c21cd6.pdfIn PDF document text
    • https://selenaza.weebly.com/uploads/1/3/4/8/134878333/dawikujoped.pdfIn PDF document text
    • https://muvaxajipafe.weebly.com/uploads/1/3/5/3/135313420/509a89da0.pdfIn PDF document text
    • https://denofunafefu.weebly.com/uploads/1/3/4/7/134750316/kojonivalonof_waxoketadedopef.pdfIn PDF document text
    • https://bizegesozuno.weebly.com/uploads/1/3/3/9/133997168/nofanejenitaxofomu.pdfIn PDF document text
    • https://merasezimimuzal.weebly.com/uploads/1/3/7/5/137510453/birimosuzudefigim.pdfIn PDF document text
    • https://towoxaji.weebly.com/uploads/1/3/0/7/130740158/jimiwozi_tevuk_dagizujevabu_fegawutipupako.pdfIn PDF document text
    • https://feravenokitaj.weebly.com/uploads/1/3/6/0/136095553/c1704.pdfIn PDF document text
    • https://fukopimuwevi.weebly.com/uploads/1/3/5/3/135351499/bodutojiporame.pdfIn PDF document text
    • https://rabupipimefife.weebly.com/uploads/1/3/0/8/130874594/7708589.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://demopefo.pbworks.com/f/standard_catalog_of_world_coins_online.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/648ba1ca-b378-424c-b54d-e9db0dfd42f2/dotoxaziziliwom.pdfIn PDF document text
    • http://nidibewuzi.pbworks.com/f/the_top_100_drugs_clinical_pharmacology_and_practical_prescribing_2nd_edition.pdfIn PDF document text
    • http://pejuzor.pbworks.com/w/file/fetch/144876801/76430440048.pdfIn PDF document text
    • http://falufizuza.pbworks.com/f/gree_ac_error_code_h6.pdfIn PDF document text
    • http://nilanom.pbworks.com/f/donadorubinigije.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b5ef3886-d86a-40af-ac68-b1229559be4d/telisafudifivagitev.pdfIn PDF document text
    • http://mikabipi.pbworks.com/w/file/fetch/144432306/sevejamaluwosupogeduvipe.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_off0000f012.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF012 5012 bytes
SHA-256: 77cfe632e631ec9f9810650160a2c4a6ec875a8058f9bd9ce230b05e192f7b36
font_01_sfnt_off00010121.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10121 1800 bytes
SHA-256: a36eee06fef6ce219692c4ec918276ac99413e4fd1e3666e4031624f9289d620
font_02_sfnt_off000109ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109AE 18852 bytes
SHA-256: 1462de700f9a5958352ac291bb6f1d75f6a7d33a0e8997f92fba8e5497a939f9