Malicious PDF — malware analysis report

Static analysis result for SHA-256 4439b7a08d17bbf0…

MALICIOUS

PDF

73.2 KB Created: 2021-03-03 09:29:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 5d72524d1b17d3ce82c2efa7924191ed SHA-1: d64bdb24d0f6c720470ad9b1fe6962af1a0782ad SHA-256: 4439b7a08d17bbf063d876b22be2be06200f7f60d04422f319b3e02d03bccf77
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to potentially malicious content or phishing sites. The presence of external URIs and the overall structure point towards a phishing or malware distribution campaign.

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://dugedepap.ru/strik?utm_term=bissell+powerforce+bagless+turbo+filters PDF link annotation
    • http://metagopu.22web.org/10967243802.pdfIn PDF document text
    • https://cdn.sqhk.co/dirotiweze/jjd5lqQ/10450960958.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407314/normal_6024c03715bae.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457011/normal_5fe748b14a024.pdfIn PDF document text
    • http://volosaty100.xyz/what_is_dorian_grey_in_penny_dreadfulxczi8.pdfIn PDF document text
    • https://nituxokijawagez.weebly.com/uploads/1/3/0/9/130969825/2fe0af03.pdfIn PDF document text
    • https://rejaduwewuwuga.weebly.com/uploads/1/3/1/8/131856140/4527515.pdfIn PDF document text
    • https://zupavuzinopaz.weebly.com/uploads/1/3/4/2/134265708/xuwuwegudedu-kebuto-kadowebawuf-xufimotufeti.pdfIn PDF document text
    • http://fashion-deals.xyz/friday_the_13th_1980_movie_download_300mb1s782.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374983/normal_602b4c8627b15.pdfIn PDF document text
    • https://zebaraxofalolal.weebly.com/uploads/1/3/0/8/130813897/fukogola.pdfIn PDF document text
    • https://zuduloto.weebly.com/uploads/1/3/4/6/134623707/7494266.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413361/normal_5fe5a92b05a85.pdfIn PDF document text
    • http://italiahot.fun/govidolesixepect2xd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459470/normal_601aefd0623b7.pdfIn PDF document text
    • https://vazejaxos.weebly.com/uploads/1/3/1/3/131382607/tadasonazad.pdfIn PDF document text
    • https://zowamuzifam.weebly.com/uploads/1/3/1/1/131163536/bc3c731.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tuzotulerijenej.rf.gd/exploring_strategy_text_and_cases_answers.pdfIn PDF document text
    • http://puwekaxaxowiza.epizy.com/90362419801.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_off0000df49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF49 5464 bytes
SHA-256: 745d0973c1198d423dd9276df8ce59474ac1a1e4564805e51044b7965f4c37ef
font_01_sfnt_off0000f208.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF208 10524 bytes
SHA-256: fbd681781d1737aab20f59fe5e32a6fa455ef254437b8dfa14ac20fec2a77dee

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