Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8b2cd638cb93e90…

MALICIOUS

PDF

77.1 KB Created: 2021-03-06 05:23:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 1e480e7577608aa6bb45317677cc5b7f SHA-1: 4aa592825d68f548bc3eb24f9775daff5ee14bb1 SHA-256: d8b2cd638cb93e90631a7a8ea0745e44804cc9a31f4b93093202aaf65cc1b19e
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf and includes a URL that appears to be a search query, reinforcing the lure aspect.

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://soxebez.ru/wix?keyword=where+did+they+film+dante%2527s+peak PDF link annotation
    • http://pedron.fun/88355588157x4hjb.pdfIn PDF document text
    • https://cdn.sqhk.co/pedajobu/icMhbcq/sifokomafaxorekavemisote.pdfIn PDF document text
    • https://mujolimu.weebly.com/uploads/1/3/4/8/134868529/laxuxi_tazetakakaful.pdfIn PDF document text
    • http://dawexefif.getenjoyment.net/honda_civic_workshop_manual.pdfIn PDF document text
    • http://afracheat3.xyz/rugowaxeziw7jkm5.pdfIn PDF document text
    • https://togoxijagujeg.weebly.com/uploads/1/3/0/7/130775712/miguzaduzu.pdfIn PDF document text
    • https://mubazujozij.weebly.com/uploads/1/3/4/7/134705676/lubatefogojopa.pdfIn PDF document text
    • https://cdn.sqhk.co/wusuzevomo/0l6sbxM/mini_basketball_hoop_walmart_canada.pdfIn PDF document text
    • http://melowew.scienceontheweb.net/entry_level_software_developer_jobs_miami.pdfIn PDF document text
    • https://nibasekugi.weebly.com/uploads/1/3/1/0/131070633/3136921.pdfIn PDF document text
    • http://bostpolamos.site/splatoon_2_amiibo_binjgb0h.pdfIn PDF document text
    • https://fezuwarojeti.weebly.com/uploads/1/3/1/3/131383544/8916890dfd7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a816121-51b4-44f1-9d87-2d627291d906/dobesitolekofaderozex.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d52abd2-af06-4c6b-a066-50e37b38c62c/karolugalogopulejumo.pdfIn PDF document text
    • https://e4fb9bf1-a3d6-4767-9bf2-2a1021e5dc09.filesusr.com/ugd/53cfc7_3a1bb3212f1d4381ba9982b7370fd283.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9625d0e3-3759-42f8-b76a-0ed13b10bd18/34052146705.pdfIn PDF document text
    • https://caa91486-5fcc-43b7-8b2b-5b817ae85bbe.filesusr.com/ugd/26bbcf_8d673a2f9ac04a7ab67e20cd8557379c.pdf?index=trueIn PDF document text
    • http://xowilewegiwo.myartsonline.com/17143090992.pdfIn PDF document text
    • https://54570836-76ea-4100-b78f-d1ba4c3cc0d1.filesusr.com/ugd/21ac59_c19ab28b090247c49755cb1bde8cb6c4.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1505ebea-ae48-4929-ac4d-0a5baffda4ca/bapifaleje.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_off0000ef9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF9E 5496 bytes
SHA-256: d41159865223d932bba4d4a383f56291ef78e97d29a7036e23d1e0122ff2aff0
font_01_sfnt_off0001023f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1023F 10764 bytes
SHA-256: 1c595770a4275fb395205f0ca4096fa3b79025430fe238e71f0cf919be971df2