Malicious PDF — malware analysis report

Static analysis result for SHA-256 33ec8fcecfb3ba91…

MALICIOUS

PDF

83.7 KB Created: 2021-06-09 06:31:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: cbdc656e715f7d5a006efbcea6233f25 SHA-1: 05dcfc87cb099c13f84b0ce372eede03c861981a SHA-256: 33ec8fcecfb3ba91f281003426df33f322230940acccb7f87d24d2f069ec5224
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 0.9990

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://philabc.ru/pbw?utm_term=fit+body+boot+camp+workouts+pdf PDF link annotation
    • https://gufekibeliwu.weebly.com/uploads/1/3/1/3/131382841/vudog.pdfIn PDF document text
    • https://simokodopegaliw.weebly.com/uploads/1/3/0/7/130776428/vikob.pdfIn PDF document text
    • https://xutativapejan.weebly.com/uploads/1/3/4/5/134521393/rapekadepuzewatido.pdfIn PDF document text
    • https://ziluxofizavamo.weebly.com/uploads/1/3/6/0/136009732/ffa0403e0fae.pdfIn PDF document text
    • https://rawowoxok.weebly.com/uploads/1/3/4/3/134309987/1814485.pdfIn PDF document text
    • https://dujedagopodiku.weebly.com/uploads/1/3/4/5/134580966/semar-sereg-lisunoxizok-dizokawagorola.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413578/normal_60478d7eaa3b6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477630/normal_605ee6c3914b3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388824/normal_6044c7a306c35.pdfIn PDF document text
    • https://sajejedazo.weebly.com/uploads/1/3/3/9/133999783/0b6d131a1fca47.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449009/normal_605c2f532f1e7.pdfIn PDF document text
    • https://mamifamutimas.weebly.com/uploads/1/3/1/8/131871874/5711482.pdfIn PDF document text
    • https://xobiduri.weebly.com/uploads/1/3/1/4/131437628/2066310.pdfIn PDF document text
    • https://selimubujupaso.weebly.com/uploads/1/3/4/8/134847774/ef84200.pdfIn PDF document text
    • https://vebipebetas.weebly.com/uploads/1/3/4/0/134012388/dozavakagorebap.pdfIn PDF document text
    • https://veraroligesabo.weebly.com/uploads/1/3/4/3/134377370/temasodawelovamava.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://vadibun.pbworks.com/w/file/fetch/144910437/77178125486.pdfIn PDF document text
    • http://kedidozapudo.pbworks.com/w/file/fetch/144919674/2012_cvo_ultra_classic_for_sale.pdfIn PDF document text
    • http://sizolasipape.pbworks.com/w/file/fetch/144578136/erc_neonatal_resuscitation_guidelines_2020.pdfIn PDF document text
    • http://xojipoxar.pbworks.com/f/b_flat_blues_scale_alto_sax.pdfIn PDF document text
    • http://paderukut.pbworks.com/w/file/fetch/144687240/jevoginisawi.pdfIn PDF document text
    • http://negaboxa.pbworks.com/w/file/fetch/144465135/88817563021.pdfIn PDF document text
    • http://zekodunu.pbworks.com/f/jeepers_creepers_2001_full_movie_in_hindi_dubbed.pdfIn PDF document text
    • http://pefagisunel.pbworks.com/f/27873319671.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_off0000f9e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9E5 5280 bytes
SHA-256: 0e7cb9f4f81b3c5ccd9239318a42212b2fb42603df08747a5f03e0bd56ba1c21
font_01_sfnt_off00010bec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BEC 11432 bytes
SHA-256: 92c95f7e88de96e90a476b2b0d9f3d4190d1e71afffceeed0618c1dcff3b06fd
font_02_sfnt_off00013298.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13298 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176