Malicious PDF — malware analysis report

Static analysis result for SHA-256 27756254e2ad7bf4…

MALICIOUS

PDF

75.7 KB Created: 2021-03-18 13:03:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: c853b25e99286d29260c32b03e63eb6e SHA-1: 735ef47e4459a2cc419b0269c607a6a2c08bf819 SHA-256: 27756254e2ad7bf4e6fed2c593ed344380be98f2a40867e0a4dff36f5776bf84
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 document contains numerous external links, many hosted on disposable domains, suggesting it functions as a link farm to redirect users to potentially malicious content. The presence of embedded URLs and the overall structure point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://jottigo.ru/award?keyword=barefoot+investor+pdf+download+2020 PDF link annotation
    • https://cdn.sqhk.co/burexewejam/jcvjdjh/vp_racing_dealer_near_me.pdfIn PDF document text
    • http://zavodtriumf.com/goverijubiwivivojobizodggybi.pdfIn PDF document text
    • https://cdn.sqhk.co/kutajanode/fjgahfI/best_hits_2019_list.pdfIn PDF document text
    • http://megalit-korolev.ru/the_new_bible_commentary_revisedwvqxy.pdfIn PDF document text
    • https://cdn.sqhk.co/ganuniwiku/jhhjghj/reversion_clause_real_estate.pdfIn PDF document text
    • http://ipatovaalena.ru/vefimifobitis2yzz.pdfIn PDF document text
    • http://zagunur.22web.org/rofidafe.pdfIn PDF document text
    • https://cdn.sqhk.co/redusebi/bzjgjdy/best_tiles_for_bathroom_shower_walls.pdfIn PDF document text
    • http://wovemabib.iblogger.org/xarifagirexujijusox.pdfIn PDF document text
    • http://zenezadeso.22web.org/26689294428.pdfIn PDF document text
    • https://cdn.sqhk.co/jijatidos/hcggtjg/download_game_kill_shot_virus_mod_apk.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/eeb89451-434f-41dc-8388-b0daf38ce8b1/wuzezazeru.pdfIn PDF document text
    • http://fetewuzapozoza.rf.gd/pajekawivunixafumur.pdfIn PDF document text
    • http://tolimimagag.epizy.com/30416042807.pdfIn PDF document text
    • http://zumoriko.epizy.com/adobe_xd_for_windows_8._1_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/84e87233-6fe8-4503-9251-7cfdf5dac7d9/savozane.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eba28405-b5a9-4f95-acd2-84a7ea212ad9/poulan_p3416_primer_bulb.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/73d2e874-0a16-4d72-b750-5a96390bbbdb/21686245274.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4c5229dd-ca36-4d00-8267-5a90875c22ca/are_dna_tests_accurate.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_off0000e66b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE66B 5508 bytes
SHA-256: 2b0a73782d3a02b194db09fd13cffedb8228eab817b9011b1df230ca680a1683
font_01_sfnt_off0000f952.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF952 11824 bytes
SHA-256: 5448d688a2a2a3edf7f847d11e53b559a6bb323ffba092e132590902d3b7aadd

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