Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4c735d5587f6199…

MALICIOUS

PDF

74.4 KB Created: 2021-01-16 19:00:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 0f74124aa4abaffc848a07f6006d041a SHA-1: d233820fa0f236aa93e1e0ef0fcf16eccb349e2b SHA-256: f4c735d5587f61992cc9b293c4fe1cf31bf3836a9d2e349cee88d6d5df9a3f60
244 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and a machine learning classifier, including critical alerts for linking to known malicious redirectors and acting as an SEO link farm. The document body, though heavily obfuscated, contains references to search terms and application details, suggesting a lure to external, potentially malicious, websites. The presence of numerous embedded URLs points towards an attempt to redirect users to phishing or malware distribution sites.

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://ggtraff.ru/123?utm_term=best+manual+die+cutting+machine+uk In PDF document text
    • https://cdn.sqhk.co/pevizopubok/jbvichd/launchpad_macmillan_app.pdfIn PDF document text
    • https://site-1238341.mozfiles.com/files/1238341/32787875146.pdfIn PDF document text
    • https://site-1175777.mozfiles.com/files/1175777/amazing_facts_in_us_history_answer_key.pdfIn PDF document text
    • https://site-1171554.mozfiles.com/files/1171554/1873016229.pdfIn PDF document text
    • https://site-1166603.mozfiles.com/files/1166603/impulse_response_samples_viper4android.pdfIn PDF document text
    • https://cdn.sqhk.co/vetedaxuzele/jfigEhh/rush_hour_4_trailer_2019.pdfIn PDF document text
    • https://mujunoba.weebly.com/uploads/1/3/2/6/132682006/nusalegazowejig.pdfIn PDF document text
    • https://site-1176067.mozfiles.com/files/1176067/horror_movies_free_in_tamil.pdfIn PDF document text
    • https://lorinifufa.weebly.com/uploads/1/3/4/3/134357706/wegezotar.pdfIn PDF document text
    • https://dexasarejujevi.weebly.com/uploads/1/3/1/4/131454537/6118152.pdfIn PDF document text
    • https://sasominafa.weebly.com/uploads/1/3/4/3/134362810/lakizupepuboxojovomo.pdfIn PDF document text
    • https://ruzizoradum.weebly.com/uploads/1/3/4/3/134317959/3401086ad.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/teximikamukubo/biology_gcse_for_aqa_kerboodle_book_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/sesafefanulokam/waves_maxxaudio_pro_software.pdfIn PDF document text
    • https://s3.amazonaws.com/livivuvuwugeb/livros_de_administrao_publica_em.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_off0000e482.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE482 5368 bytes
SHA-256: d8448bf713696a62eaaee457db1b8b0eed67bebb2ce26cc7641083245e7c5a13
font_01_sfnt_off0000f69f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF69F 11420 bytes
SHA-256: c17c2679eaa5ae697b5a9c356a98e6d3f51e98b65b1f7b755dd29023e8a60805

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