Malicious PDF — malware analysis report

Static analysis result for SHA-256 b56135f187bdc967…

MALICIOUS

PDF

82.7 KB Created: 2021-03-14 04:39:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: ed5f60b16ff2fcb98901167235b087c8 SHA-1: 2b85936659f678d2ec301c0a5dc181287cf12e0b SHA-256: b56135f187bdc967e7806bd2f413b9b0f57993124c084df09e3aebf4b4bb013a
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many hosted on disposable domains, as indicated by the PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing further malware. The embedded URLs and the nature of the link farm point towards an attempt to manipulate search engine results or lead users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://pelibifir.ru/wix?keyword=yumi+ishiyama+heroes+wiki PDF link annotation
    • http://jenerotisa.mywebcommunity.org/76902670902.pdfIn PDF document text
    • https://rotalexabif.weebly.com/uploads/1/3/1/3/131381819/betijonemixu-rewiz-tovodujimu-vobebavubeja.pdfIn PDF document text
    • https://saxigixerugeri.weebly.com/uploads/1/3/4/5/134585582/b5eb55.pdfIn PDF document text
    • http://mamefumiwuto.mywebcommunity.org/seramonizufisaxikim.pdfIn PDF document text
    • http://tifoxikutawe.sportsontheweb.net/tabla_de_conversion_fracciones_de_pulgadas_a_milimetros.pdfIn PDF document text
    • https://punujagenak.weebly.com/uploads/1/3/0/7/130775029/gumazafuvapu.pdfIn PDF document text
    • http://wijofotezopadik.medianewsonline.com/75039736002.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/busutafitufe/maths_formulas_for_class_9_chapter_2.pdfIn PDF document text
    • https://06e27459-8a58-4d01-a48e-f853eab966f6.filesusr.com/ugd/55f1a0_d00794bb1eae492694d71982b3c912d6.pdf?index=trueIn PDF document text
    • https://f2d828cf-06d9-46ea-85af-d88b0bc20d44.filesusr.com/ugd/501a20_de3a4ff72e1d4bcabb1d470cb738c08e.pdf?index=trueIn PDF document text
    • https://a3de454e-1598-42bb-a259-4eb69c42f179.filesusr.com/ugd/fb5067_8f80a2fa167c4ba9bd975ca4a43d0e81.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/05a52cd4-bbfe-47f0-a9c7-bb884fa7ff30/gukusazibojewebokib.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e8924e84-b9ac-4cbd-9a4f-b71763e72c9f/goxederunorowalaj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/30a9cace-8f1b-45a0-910b-c9a77bcfaf46/zinokiwavosuva.pdfIn PDF document text
    • https://s3.amazonaws.com/mudurixo/28064238255.pdfIn PDF document text
    • https://3fb740b9-71d8-4183-8edb-de11b68c0a29.filesusr.com/ugd/1fbf8b_5f99ee767903460cbfbcba7ff7bf6b2b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xijuxosisomuna/nice_guidelines_constipation_palliative_care.pdfIn PDF document text
    • https://s3.amazonaws.com/zuponefi/talk_to_me_cavetown_piano_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/fosalizuzu/lay_down_crossword_answer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/be862b21-1b99-4953-9727-6062ae942dc7/38903074848.pdfIn PDF document text
    • https://33da92c3-26de-4f6b-bf12-1693cb6a6e79.filesusr.com/ugd/0307f2_c67fab06fffe4a67b69a2115f045cd45.pdf?index=trueIn 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_off0000fb97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB97 3432 bytes
SHA-256: de2fdffc7c4ae1864e6b2e2895c072d6d3367adc7669250f6468cdf716513ed3
font_01_sfnt_off000107e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107E8 5112 bytes
SHA-256: 597bfe4ff31d8e3f56bfcc179225604ec857e45d13a0422a0e570b429e36e05e
font_02_sfnt_off00011938.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11938 10764 bytes
SHA-256: 89ab3877255ae63743862e30db5b047894f69b3aad02182637f44a172acf11e0