Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1a8be1d72dacb08…

MALICIOUS

PDF

72.8 KB Created: 2021-03-03 00:23:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 27b091454b3d3f4abe06499c75eeb5a9 SHA-1: 7ae432eada8af553a2772a2f7c8f1495a32dd7c7 SHA-256: a1a8be1d72dacb08ea2a98c70a7f09140a42d8c6b9897f3afb1262dc8e69d655
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The PDF contains numerous embedded URLs pointing to disposable domains and link farms, suggesting it is designed to redirect users to potentially malicious websites. The presence of external URIs and the link farm heuristic strongly suggest a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://dugedepap.ru/award?keyword=skill+set+or+skill-set PDF link annotation
    • https://cdn.sqhk.co/bekutojeke/haxjbun/tedatejibiriburuvox.pdfIn PDF document text
    • http://pigovaze.iblogger.org/65414505271.pdfIn PDF document text
    • http://help-igcopyright.xyz/checklist_clipart_black_and_white_catcgosl.pdfIn PDF document text
    • http://reduslimitaly.website/31078438955srqg4.pdfIn PDF document text
    • http://damita.fun/92615060618g4pbz.pdfIn PDF document text
    • http://belkwigs.com/what_is_the_spiritual_meaning_of_chrysanthemum45x5f.pdfIn PDF document text
    • http://kataeta.club/oracle_sql_developer_installation_guidemj075.pdfIn PDF document text
    • http://idealica-it.website/mashup_songs_online_free_without_downloadfh7xq.pdfIn PDF document text
    • https://cdn.sqhk.co/susojareb/4ahbjc3/76427405477.pdfIn PDF document text
    • http://italiahot.space/geronimo_stilton_author_in_real_lifevmwf9.pdfIn PDF document text
    • https://cdn.sqhk.co/wemitupu/F2jj143/mlb_news_mets.pdfIn PDF document text
    • http://naromedicina.ru/kusoxavebuvewedumaxinun0li2.pdfIn PDF document text
    • http://gusitolife.iblogger.org/define_alliteration_form.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lubudag.epizy.com/19496751001.pdfIn PDF document text
    • https://s3.amazonaws.com/firudegix/4067840752.pdfIn PDF document text
    • http://ruguweronum.rf.gd/free_brother_printer_driver_dcp-_t500w.pdfIn PDF document text
    • http://vovokab.rf.gd/filuzonidezuru.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_off0000e3e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3E1 4668 bytes
SHA-256: 86941e572b4a129da1db54c4c9c17e82c195503af2b57e9b315313e22b21e5f1
font_01_sfnt_off0000f3d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3D7 10092 bytes
SHA-256: 8638ee8afe5b6ccbf345ca5632e93d02caded1888beee760643379652fa4da45

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