Malicious PDF — malware analysis report

Static analysis result for SHA-256 01237a759ab1bef8…

MALICIOUS

PDF

77.2 KB Created: 2021-06-11 03:51:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 66a77dca963a135e3b4eba7392a62e6e SHA-1: c26df21f2cd290ebe9880133b3faeb2579117ae2 SHA-256: 01237a759ab1bef8dc288fe2171a743b46963c03dc70c29d125fba0dc6b81801
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The file contains a large number of external links, many pointing to disposable hosting services, suggesting it functions as a link farm designed to redirect users to potentially harmful content. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or content-luring attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://laborke.ru/pbw?utm_term=yasin+sura+audio PDF link annotation
    • https://tiwebusimevadeb.weebly.com/uploads/1/3/5/3/135346158/mokugeg.pdfIn PDF document text
    • https://dururamud.weebly.com/uploads/1/3/4/8/134846475/vepik_vesutave.pdfIn PDF document text
    • https://tupeduwexawagov.weebly.com/uploads/1/3/1/6/131607208/makujowag_kawinelesuvidit_vogutelebebupe_buwejo.pdfIn PDF document text
    • https://defuboxuzunusam.weebly.com/uploads/1/3/3/9/133986960/dexafekonitenorada.pdfIn PDF document text
    • https://wigimosasalak.weebly.com/uploads/1/3/2/8/132814057/vubagisazek_nukafigewof_vemaxitatinuli_sulelegag.pdfIn PDF document text
    • https://rudunusom.weebly.com/uploads/1/3/4/6/134602981/5069164.pdfIn PDF document text
    • https://fopilifufisi.weebly.com/uploads/1/3/6/0/136055159/6886714.pdfIn PDF document text
    • https://bovoladimuva.weebly.com/uploads/1/3/0/9/130970023/9794852.pdfIn PDF document text
    • https://xabomipa.weebly.com/uploads/1/3/4/4/134484571/rofukudasikewul-tofos-dogufurubavot.pdfIn PDF document text
    • https://latewumopinigan.weebly.com/uploads/1/3/4/3/134313498/5839629.pdfIn PDF document text
    • https://zipebamaxotunev.weebly.com/uploads/1/3/2/8/132814247/1329944.pdfIn PDF document text
    • https://bilugejedegigel.weebly.com/uploads/1/3/4/0/134017605/gewaxujegaxena.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xemeganavon.pbworks.com/f/the_books_of_the_bible_in_chronological_order.pdfIn PDF document text
    • http://ludagobef.pbworks.com/w/file/fetch/144808197/suzom.pdfIn PDF document text
    • http://poxanoralanu.pbworks.com/w/file/fetch/144604656/how_to_connect_to_lorex_camera.pdfIn PDF document text
    • http://wiwudoje.pbworks.com/w/file/fetch/144882114/future_tense_practice_worksheets.pdfIn PDF document text
    • http://mizelabe.pbworks.com/f/how_to_chick_fil_a_rewards_work.pdfIn PDF document text
    • http://xanosisa.pbworks.com/f/2k17_mod_apk__50____Low__0.pdfIn PDF document text
    • http://supatibu.pbworks.com/w/file/fetch/144428136/73866048780.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d80a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD80A 4748 bytes
SHA-256: 0e73c9a403171e0a38864e058968bcf560fb924ae4cb4e1d7440f0c42e7c2610
font_01_sfnt_off0000e837.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE837 11272 bytes
SHA-256: 3d39ddbc1718425b797c767738cc798cb0ef3ec6ed07b9ff766f3210c44b0d32
font_02_sfnt_off00010e08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E08 17420 bytes
SHA-256: b8e94bb536dd9c4b3bf057d0617cbe1bbdbe16c14f504cfb08c4ecc7eca4cd98