Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8de96c2b980dcb9…

MALICIOUS

PDF

77.0 KB Created: 2021-05-18 06:20:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 10d7e4b8d5c607795e9136a0dd34821e SHA-1: 1b1f9abc761338a2d0a99fe40daa29507714ba3b SHA-256: c8de96c2b980dcb9b85f3e411157f7506fdd56f2d20862a9f04e9d0e8c218966
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://jumiwimov.ru/strik?utm_term=mashed+potatoes+recipe+with+heavy+cream PDF link annotation
    • https://munuradon.weebly.com/uploads/1/3/1/8/131859370/popape.pdfIn PDF document text
    • https://rinuwunebod.weebly.com/uploads/1/3/4/7/134750090/60a78a5f6b64332.pdfIn PDF document text
    • https://bogonifad.weebly.com/uploads/1/3/4/1/134108647/gejumadovawet.pdfIn PDF document text
    • https://vimanofadubob.weebly.com/uploads/1/3/5/3/135304206/577679.pdfIn PDF document text
    • https://leduxuma.weebly.com/uploads/1/3/2/8/132814900/miluwubi.pdfIn PDF document text
    • https://kosofisipituje.weebly.com/uploads/1/3/5/3/135329454/puxukujowifav-renoguzoj-zijuwon.pdfIn PDF document text
    • http://xejikunibe.22web.org/auditing_notes_for_b._com_3rd_year.pdfIn PDF document text
    • http://nifamepejon.22web.org/should_we_pray_to_diet.pdfIn PDF document text
    • https://xakasevam.weebly.com/uploads/1/3/4/5/134509313/c1a294.pdfIn PDF document text
    • https://wadagoxegoti.weebly.com/uploads/1/3/4/3/134385229/9176367.pdfIn PDF document text
    • http://gelixovuxa.22web.org/carbono_14_usos_y_aplicaciones.pdfIn PDF document text
    • https://makonajarozov.weebly.com/uploads/1/3/4/3/134341931/756084c7df8dcf9.pdfIn PDF document text
    • https://puxasune.weebly.com/uploads/1/3/1/3/131379014/lapafabemaduwerulis.pdfIn PDF document text
    • https://milonotupilo.weebly.com/uploads/1/3/5/3/135347339/6349542.pdfIn PDF document text
    • https://tomosuboma.weebly.com/uploads/1/3/5/3/135382902/c4e832120.pdfIn PDF document text
    • http://tukazijib.22web.org/golang_template_string_join.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://napipipazapuka.epizy.com/colorlib_free_bootstrap_admin_templates.pdfIn PDF document text
    • http://pavemamixazose.rf.gd/pigesaz.pdfIn PDF document text
    • http://tebedenuvar.rf.gd/22976127106.pdfIn PDF document text
    • http://mijitililifi.epizy.com/cerebellar_ataxia_physiotherapy_management.pdfIn PDF document text
    • http://vibomogizago.rf.gd/millermatic_130_xp_for_sale.pdfIn PDF document text
    • http://fumejiwa.epizy.com/cholestatic_jaundice.pdfIn PDF document text
    • http://nakobebujem.epizy.com/66673124361.pdfIn PDF document text
    • http://pumifobivo.epizy.com/birthday_party_invite_templates_word.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_off0000ef07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF07 5540 bytes
SHA-256: b4a94471c31e3653c5b2e6b3ac59615fecae775c80ea9cd7bc8d72e6fff2c550
font_01_sfnt_off000101d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101D9 10704 bytes
SHA-256: 5578b89534e720595abbdb581302798c83d507edfebb3e88ada55a5cb6a2bffd

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