Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf0fb0e53fdf58a7…

MALICIOUS

PDF

80.6 KB Created: 2021-06-11 10:55:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: a4b8a4a658cb75019bfa7b107a872f77 SHA-1: 9d4a745fb1a31fe5d8a6436cf8d90486be3d523b SHA-256: cf0fb0e53fdf58a7e6041a11a994faaf7a8f0639e8e86b02d5cf1c6d28434db5
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-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://synerhu.ru/pbw?utm_term=who+is+the+richest+man+in+history PDF link annotation
    • https://mabaxezo.weebly.com/uploads/1/3/4/7/134766945/tamexe-gawipegobanumi.pdfIn PDF document text
    • https://mujurusema.weebly.com/uploads/1/3/4/8/134846640/gipobepama_foririvo_pasinogufezekel.pdfIn PDF document text
    • https://tidovikazixuwuj.weebly.com/uploads/1/3/4/3/134316919/fisaxetukemeno.pdfIn PDF document text
    • https://ligexomapaku.weebly.com/uploads/1/3/4/3/134321337/b49a1737ce28.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376086/normal_60335248dac47.pdfIn PDF document text
    • https://vebupixe.weebly.com/uploads/1/3/4/8/134854050/rawodivixox.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404503/normal_5ff8035e7a877.pdfIn PDF document text
    • https://lotuvimipel.weebly.com/uploads/1/3/0/7/130739731/8a5cdb9844c3d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380699/normal_5fd97bb5a7fca.pdfIn PDF document text
    • https://xesejiru.weebly.com/uploads/1/3/4/7/134716288/a7b835a3592.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496577/normal_606e554775a43.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451033/normal_605ffb2900f3c.pdfIn PDF document text
    • https://nusoselif.weebly.com/uploads/1/3/4/4/134470887/nifawedesikat.pdfIn PDF document text
    • https://tibegoruk.weebly.com/uploads/1/3/4/8/134862976/bdb064fee6f6b58.pdfIn PDF document text
    • https://nexonurobev.weebly.com/uploads/1/3/4/3/134371674/kezew_bomutunuvuxox_sibodagub_kakejefarifudam.pdfIn PDF document text
    • https://lewofadexireg.weebly.com/uploads/1/3/4/8/134868993/zarimipoka.pdfIn PDF document text
    • https://dujedagopodiku.weebly.com/uploads/1/3/4/5/134580966/792331.pdfIn PDF document text
    • https://dolilifiwu.weebly.com/uploads/1/3/4/4/134401054/ce9f9b13dabc964.pdfIn PDF document text
    • https://wuzafonufiza.weebly.com/uploads/1/3/4/3/134341979/watinumomefamabu.pdfIn PDF document text
    • https://zadujemerumid.weebly.com/uploads/1/3/2/6/132695269/junakinesusu.pdfIn PDF document text
    • https://dagepafu.weebly.com/uploads/1/3/2/7/132740813/rifazorofixifaz_fonete_dademumubotu_dafegiwij.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://barumena.pbworks.com/f/does_iphone_have_more_emojis_than_samsung.pdfIn PDF document text
    • http://kigemulu.pbworks.com/w/file/fetch/144551088/nice_2020_cars_under_30k.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_off0000f133.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF133 4908 bytes
SHA-256: 5f825cc529faf8d9310fe820ecb20f681a612dca68d7ee3f296097c0585f92eb
font_01_sfnt_off000101be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101BE 10704 bytes
SHA-256: 6506a1a06f3016e5aef10c296019f2d6c4e8b1af2f9bb09f81e267f9b429d65c
font_02_sfnt_off0001263d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1263D 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34