Malicious PDF — malware analysis report

Static analysis result for SHA-256 310d5e8e40f0af67…

MALICIOUS

PDF

71.5 KB Created: 2021-02-27 16:14:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 258cdcefba385cc23796879f3d7f0ca6 SHA-1: 37e63fd82817c1354d32fc72e49415c27dbf8ed7 SHA-256: 310d5e8e40f0af67ef5fc66211901ca57a13f9c7b3a1f2312b4254f9f1f8e3d2
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm used for phishing or malware distribution. The embedded URLs, such as 'https://vilenefex.ru/award?keyword=apc+back-ups+rs+500va+230v', likely serve as lures to redirect users to malicious sites. No scripts were extracted, but the PDF structure and numerous external links strongly suggest a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://vilenefex.ru/award?keyword=apc+back-ups+rs+500va+230v PDF link annotation
    • https://cdn.sqhk.co/jaguwubax/hjidN8O/69224389461.pdfIn PDF document text
    • https://sufafiderek.weebly.com/uploads/1/3/0/8/130814754/xabiperekax_xeleba_dupupivokiro_mavefibuse.pdfIn PDF document text
    • http://zisuroto.mygamesonline.org/gewapasanogulekexi.pdfIn PDF document text
    • https://wonakusoxenim.weebly.com/uploads/1/3/5/3/135340368/zojoxuji.pdfIn PDF document text
    • https://fuzurisef.weebly.com/uploads/1/3/4/3/134369427/nupev.pdfIn PDF document text
    • https://tevumusavobe.weebly.com/uploads/1/3/4/1/134108657/foxobuna.pdfIn PDF document text
    • http://beririka.scienceontheweb.net/how_many_books_of_fifty_shades_of_grey_are_there.pdfIn PDF document text
    • https://posenumu.weebly.com/uploads/1/3/0/7/130776111/kafub.pdfIn PDF document text
    • http://fepaporipevari.mypressonline.com/semuvus.pdfIn PDF document text
    • http://pusaburuku.22web.org/altered_genes_twisted_truth_free.pdfIn PDF document text
    • https://zoxiniguve.weebly.com/uploads/1/3/4/5/134584112/fujorij-zirimedagudaj-pimavomor-domuvo.pdfIn PDF document text
    • https://zodoxofavuzawa.weebly.com/uploads/1/3/1/4/131437464/golodojijuz.pdfIn PDF document text
    • http://xorabawik.medianewsonline.com/sunbeam_electric_blanket_controller_bl0600.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dodigemadepa.epizy.com/algorithm._sty_package_latex.pdfIn PDF document text
    • http://tamuluworab.rf.gd/depukopatose.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_off0000d11a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD11A 5740 bytes
SHA-256: 593c6c03b817b9e91a6a6eff067145bfe515bb0836f7e5044fafd97d717fd1ca
font_01_sfnt_off0000e4c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4C7 13608 bytes
SHA-256: 201f8a0f080bb891cd93b7fd3e1d56b4f9c658019cb390b7b10c30b101a82b73

Open this report in the interactive analyzer, or submit your own file for analysis.