Malicious PDF — malware analysis report

Static analysis result for SHA-256 7dfc5f85657cff7d…

MALICIOUS

PDF

81.8 KB Created: 2021-03-14 15:08:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: a7aaf9094bc3a7ccffb80e2de22ee971 SHA-1: d9d4768e9ad4d8d56798d8f57c77ea8fc84df539 SHA-256: 7dfc5f85657cff7d3b58958c66985540b078c3b34fbb816cfcf261a720c25bbd
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or scam intent. It contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, suggesting an attempt to obscure the final destination or distribute malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this. While no scripts were explicitly extracted, the nature of the embedded links and the overall detection suggest it's designed to redirect users to malicious sites, likely for credential harvesting or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://kuzutuzo.ru/strik?utm_term=american+red+cross+clothing+donation+near+me PDF link annotation
    • http://manaluw.iblogger.org/automate_the_boring_stuff_with_python_github.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485322/normal_5fe9034bf21f5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365562/normal_5fff1122a2a61.pdfIn PDF document text
    • http://kutatit.getenjoyment.net/zitamipi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484380/normal_604250c9551f1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384143/normal_5fd78e388ed1e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494663/normal_5fe8e5edf328f.pdfIn PDF document text
    • http://sozetil.66ghz.com/noncontrolling_interest_on_balance_sheet.pdfIn PDF document text
    • http://mobufuwiwid.medianewsonline.com/b_d_singh_biotechnology_book_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368762/normal_603338cd0bb5d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446151/normal_60264c07b08d6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://koxowideza.epizy.com/47759747817.pdfIn PDF document text
    • http://jukiwifid.rf.gd/sfg_2_game_for_pc.pdfIn PDF document text
    • http://dalapodomunok.epizy.com/what_is_the_gutenberg_bible_worth.pdfIn PDF document text
    • http://jiwodiw.myartsonline.com/kosugawo.pdfIn PDF document text
    • http://soreras.epizy.com/what_are_the_five_books_of_moses_in_order.pdfIn PDF document text
    • http://xazopufegi.onlinewebshop.net/jasuxifuvuviwaxar.pdfIn PDF document text
    • http://forojiwimudobo.atwebpages.com/87869838680.pdfIn PDF document text
    • http://ralirajuz.atwebpages.com/xokofifipejabobifulunuka.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f5c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5C8 5128 bytes
SHA-256: 8c0a7616b6bd3de0bf90722d0d38822de1c0e73737cff628125925ca80330dca
font_01_sfnt_off000106f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106F7 10700 bytes
SHA-256: 4cfc5792482ef408d83584efe34583023f20825a20b3462d39b9391e9d794456
font_02_sfnt_off00012b82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B82 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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