Malicious PDF — malware analysis report

Static analysis result for SHA-256 451c3f6092e36db0…

MALICIOUS

PDF

89.5 KB Created: 2021-05-04 12:28:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 55064aeec41cbe2634d7ce243138e87d SHA-1: 5a3f766ce2e6cd9c09ff0ce5d45f956b3ee2ce84 SHA-256: 451c3f6092e36db04fcc84a3742c338fee3278837cf493d97cf2ee9166f30d78
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains, and exhibits characteristics of a link farm designed to redirect users. The presence of external URIs and the 'link farm' heuristic strongly suggest an attempt to direct users to malicious sites, likely for phishing 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://leonvi.ru/strik?utm_term=diary+of+wimpy+kid+cast+2017 PDF link annotation
    • https://cdn.sqhk.co/dodiniwotud/b1LMjjQ/cut_the_cake_lyrics_average_white_band.pdfIn PDF document text
    • https://cdn.sqhk.co/jokawefezo/rijwge2/gonapirag.pdfIn PDF document text
    • http://rodojad.iblogger.org/what_the_bible_says_about_strong_wine.pdfIn PDF document text
    • http://nisisigewu.iblogger.org/online_free_car_racing_games_for_android.pdfIn PDF document text
    • http://neluvukod.22web.org/mefelebikaniw.pdfIn PDF document text
    • http://zukirudon.mypressonline.com/manual_chimie_anorganica_clasa_9.pdfIn PDF document text
    • https://cdn.sqhk.co/noperizapewo/ihf316s/eternity_warriors_4_mod_apk_free_download.pdfIn PDF document text
    • http://sabawosekedap.22web.org/safety_tips_for_warehouse_work.pdfIn PDF document text
    • https://cdn.sqhk.co/jivazufevi/njeMibx/horror_movie_bucket_list_poster.pdfIn PDF document text
    • http://rezisekuvaz.mypressonline.com/76388807294.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vekejikusuvi.epizy.com/popimepavulajonipata.pdfIn PDF document text
    • http://pemaravodowo.rf.gd/prc_let_answer_sheet.pdfIn PDF document text
    • https://63b1f34b-4847-450f-8d9a-4788d10e1cf5.filesusr.com/ugd/451a43_99f7bfc6aeef4853b866dff6c2788bfb.pdf?index=trueIn PDF document text
    • http://xogaduzop.atwebpages.com/bharat_ka_naksha_hd_download.pdfIn PDF document text
    • http://dopelatov.epizy.com/45330249001.pdfIn PDF document text
    • https://s3.amazonaws.com/feseni/bge_electric_report_outage.pdfIn PDF document text
    • https://s3.amazonaws.com/nitizobuv/strategic_capacity_planning.pdfIn PDF document text
    • https://d064ede3-316f-4d13-8ec5-014b2136b3bd.filesusr.com/ugd/154db6_0601123dec9a49a6ae97fb5991930915.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wuniku/30814699848.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_off00011ece.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ECE 5932 bytes
SHA-256: b2cc0841355908717217362800a62de21b122664ed6a56e193ecc65e722d8ce4
font_01_sfnt_off00013324.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13324 11052 bytes
SHA-256: 04a042f4d21a3395781318f47b08154f1d5294a2d94359186ea2b20c613d662c

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