Malicious PDF — malware analysis report

Static analysis result for SHA-256 453ed23149b4522e…

MALICIOUS

PDF

88.6 KB Created: 2021-03-07 03:23:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 3cbcc6975ae57ce2fdaf22cb39f06aaa SHA-1: 6e177885ddf51e2a76af20e6ceceb57f32fde85d SHA-256: 453ed23149b4522e54075ec8f9130a3e14adc7154d7e2b09e1da0b2ddc06b3be
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to disposable domains and link farms, suggesting a phishing or malware distribution scheme. The document body, though partially corrupted, contains text related to 'Forma de comunicación escrita' and references wkhtmltopdf, indicating it's likely a lure document designed to redirect users to malicious sites.

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://jottigo.ru/strik?utm_term=forma+de+comunicaci%25C3%25B3n+escrita PDF link annotation
    • https://cdn.sqhk.co/divoxisig/e0gc0gd/glowgrid_how_to_play.pdfIn PDF document text
    • http://beliyden.xyz/how_much_is_baby_grand_piano_worthxp2eb.pdfIn PDF document text
    • https://cdn.sqhk.co/vivutazawi/ggdIhjS/pixelmon_mod_apk_download_for_android.pdfIn PDF document text
    • https://cdn.sqhk.co/riroxale/dlboRtr/turbotax_card_balance_text_number.pdfIn PDF document text
    • https://cdn.sqhk.co/fejavegiwo/gjijhcY/64806064915.pdfIn PDF document text
    • http://nemosixumeki.mypressonline.com/xilogerigiratusagin.pdfIn PDF document text
    • https://cdn.sqhk.co/metexemoraga/WUji3jj/david_s_model_of_strategic_management_process.pdfIn PDF document text
    • https://cdn.sqhk.co/xixumobun/jc44gdT/48962738721.pdfIn PDF document text
    • http://lewijufe.sportsontheweb.net/millionaire_next_door_audiobook_free.pdfIn PDF document text
    • https://cdn.sqhk.co/kinemefuwa/Ngfggsk/zazevemibe.pdfIn PDF document text
    • http://fukuzowi.sportsontheweb.net/farijoletibupu.pdfIn PDF document text
    • https://cdn.sqhk.co/pomorezolo/gLgdii2/kajipakidupebovoruwefo.pdfIn PDF document text
    • https://cdn.sqhk.co/saxezekobida/aUXSg5l/fevuzilimobawepiwiveg.pdfIn PDF document text
    • https://cdn.sqhk.co/wisulekekij/h0ge6ih/neogeo_pocket_backlight.pdfIn PDF document text
    • https://cdn.sqhk.co/ramidazumiko/ivghijl/51848721778.pdfIn PDF document text
    • http://fruitnaturs.space/xajajom16gfq.pdfIn PDF document text
    • http://bigtittybella.com/generac_gp3250_parts_manual4zypl.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://palelezugob.onlinewebshop.net/midland_gxt_xtra_talk_charger.pdfIn PDF document text
    • http://vokesakogo.onlinewebshop.net/mewexix.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_off00011d00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D00 5144 bytes
SHA-256: bb028792d928348aa89f7d34870f0c98ef6b2402699e4635d122a016b4b4f773
font_01_sfnt_off00012e25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E25 11684 bytes
SHA-256: afaf3b71f2e4749016b4b172c7f40fa24a381ddbafe47effb25450ec7aed6c60

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