Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbf1238e9e9f74e1…

MALICIOUS

PDF

77.3 KB Created: 2021-01-21 02:44:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 5420a8e2a0705fec596fdacf9cbd5807 SHA-1: e2ecfe225d5adbfb7cb36d6b1303c168a8b37638 SHA-256: dbf1238e9e9f74e103064b40fb492774c43858250fdf4e7d2ab21c936315698a
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file was flagged as malicious by multiple heuristics and a machine learning classifier, indicating it likely contains malicious content. It hosts a large number of external links, many pointing to disposable domains, and at least one URL is associated with known malicious redirector infrastructure. The document body, though heavily obfuscated, suggests a lure related to a 'clothing brand catalogue'. The primary attack pattern involves directing users to potentially harmful websites, likely for phishing or malware delivery.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://gettraff.ru/aws?utm_term=clothing+brand+catalogue+pdf In PDF document text
    • https://vorexumezekadan.weebly.com/uploads/1/3/0/9/130969740/5035434.pdfIn PDF document text
    • https://site-1216840.mozfiles.com/files/1216840/inside_out_sql_server_2017_administration.pdfIn PDF document text
    • https://dutudofedibajun.weebly.com/uploads/1/3/2/8/132815365/732a53.pdfIn PDF document text
    • https://sepanafawo.weebly.com/uploads/1/3/4/3/134316973/tarokuni.pdfIn PDF document text
    • https://ditufanavuj.weebly.com/uploads/1/3/0/7/130738569/6732668.pdfIn PDF document text
    • https://lefafikof.weebly.com/uploads/1/3/0/9/130969708/rovefupaluvimo-vomavubezasik-ruzug-givepofonago.pdfIn PDF document text
    • https://cdn.sqhk.co/xekemini/ji8EjcY/electrician_apprentice_jobs_no_experience.pdfIn PDF document text
    • https://petapizegu.weebly.com/uploads/1/3/4/3/134327096/0de52333d5.pdfIn PDF document text
    • https://rewajugelawuz.weebly.com/uploads/1/3/0/7/130738764/revegobejalenuti.pdfIn PDF document text
    • https://site-1084153.mozfiles.com/files/1084153/uri_movie_online_prime_video.pdfIn PDF document text
    • https://badetujunomut.weebly.com/uploads/1/3/1/8/131857650/5552783.pdfIn PDF document text
    • https://jetosopotow.weebly.com/uploads/1/3/4/0/134018613/967c8be94892689.pdfIn PDF document text
    • https://site-1196477.mozfiles.com/files/1196477/57277813133.pdfIn PDF document text
    • https://site-1173433.mozfiles.com/files/1173433/74909674690.pdfIn PDF document text
    • https://vawevoza.weebly.com/uploads/1/3/1/4/131482963/4825225.pdfIn PDF document text
    • https://cdn.sqhk.co/lokijuzim/ihYSOhj/kifoberolebugiwipebuju.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lekedoxe.rf.gd/frskringskassan_frldrapenning_guide.pdfIn PDF document text
    • http://vepilezora.epizy.com/naina_song_mp4_male_version.pdfIn PDF document text
    • http://joriboka.epizy.com/motorcycle_engine_oil_guide.pdfIn PDF document text
    • http://kepipejesa.epizy.com/biography_full_movies_free.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_off0000f12f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF12F 5284 bytes
SHA-256: 7ba52dee7f7fd3eee48d334a7563580f8f0d83e20931ac3e2168e72dd1780789
font_01_sfnt_off00010317.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10317 11084 bytes
SHA-256: a5d62c39d3c486a43b8bfffd08583d5bc43a028df1161d4c9b580d1813b4a6ab