Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd156edf1db77189…

MALICIOUS

PDF

72.2 KB Created: 2021-03-26 10:06:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 4a61512e039755cc61ec3645cef4d253 SHA-1: 259cc884fc17e89ef87e321fc1a44ac5bc1d76a7 SHA-256: dd156edf1db77189e80face161fbeb6d28ca81e5e892ca31d481dec146e13125
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many hosted on disposable domains, suggesting a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious PDF lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://maypoin.ru/strik?utm_term=how+to+reset+my+magnavox+remote PDF link annotation
    • https://cdn.sqhk.co/gudijupimeb/eeii3ez/nimotuwigapovivapigu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366358/normal_6015a2cd87c63.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4500882/normal_5fcbc5c927138.pdfIn PDF document text
    • https://cdn.sqhk.co/rowibimibopi/ejip1hh/wuxolugilukumu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374699/normal_5fd384805ea18.pdfIn PDF document text
    • https://nomomiwadij.weebly.com/uploads/1/3/3/9/133997716/xugipesosozef-zikisipa-sazofolu-bobof.pdfIn PDF document text
    • https://jenodavosu.weebly.com/uploads/1/3/0/7/130775827/5841310.pdfIn PDF document text
    • https://cdn.sqhk.co/veleviziwew/diagcf9/27593042067.pdfIn PDF document text
    • https://norofuzalugegok.weebly.com/uploads/1/3/4/8/134882219/ritipabepusuxasi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489976/normal_5fe61b7389cbc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476590/normal_600cf4651c77d.pdfIn PDF document text
    • https://fugebigejajifad.weebly.com/uploads/1/3/1/4/131406613/2584952.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/b549b841-46db-4400-9339-aa55239ee62b/81843419002.pdfIn PDF document text
    • https://d67926d6-99fe-48a4-938f-95006fdf2de6.filesusr.com/ugd/21d82e_bbbab8f77f9b4b4fb513f541190fa6e4.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xifabilejilab/aatish_movie_song_free.pdfIn PDF document text
    • https://acfc0e76-311d-46af-9c13-f46c112eb424.filesusr.com/ugd/f90bad_51d636d2182640de977ea6a8e85dcff3.pdf?index=trueIn PDF document text
    • https://e2604e0b-f95a-4acb-b53f-a7db3827b2a1.filesusr.com/ugd/225520_5e5d0ac43d874c66950ac7824ac9b6f4.pdf?index=trueIn PDF document text
    • https://0f285ee0-1b14-49a2-8a3e-060a2db94812.filesusr.com/ugd/4bf67f_0a6a6fc0560149a4a57ad8cac9375450.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lijulijowivaze/film_animasi_kartun_lucu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/71601e77-6ee6-48f3-9ac5-62e9c7845e8c/comcast_cable_remote_control_directions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/91fbe249-2ad0-4859-9556-da46a383be20/matlab_subplot_super_legend.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2f876d64-01ea-4643-983f-c96a3aa40381/gast_vacuum_pump_saa-v110-nb.pdfIn PDF document text
    • https://bb491b24-4c81-4ccc-8daa-bf1baeb171c2.filesusr.com/ugd/93c935_5597a0d81c2c42a88cec5342b8825c1f.pdf?index=trueIn 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_off0000de53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE53 5256 bytes
SHA-256: d95185ecf1c6693790f48c653ab25f2fc8dc0fdf353c76663d062b87001d5e7f
font_01_sfnt_off0000f03a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF03A 10292 bytes
SHA-256: 52cd81c9ab68be57777ff74c9ebcd9269baf882d86d57a8a44cacaaa2f64261a