Malicious PDF — malware analysis report

Static analysis result for SHA-256 f832cafe73874f2e…

MALICIOUS

PDF

77.1 KB Created: 2021-03-14 12:52:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 2627be2cfc00a76568a113d6162c612f SHA-1: 727d3515b2c14f42d73222f3a310b71edc2c48f0 SHA-256: f832cafe73874f2ed2b71a8377ec5eb516981e63133cc7c039fc3b60964e4d5d
186 Risk Score

Malware Insights

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

The PDF file contains a significant number of external links, many pointing to disposable hosting, suggesting a link farm or SEO spam campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were directly extracted, the PDF structure and numerous external links are indicative of a malicious document designed to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • 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 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.
  • 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://resalured.ru/strik?utm_term=black+magic+books+in+urdu+pdf+download PDF link annotation
    • http://fuvesozufinefi.medianewsonline.com/tazonun.pdfIn PDF document text
    • http://conicppjry.bid/how_to_setup_canon_g3000_wifi3iews.pdfIn PDF document text
    • http://shop-kid-toys.online/bass_guitar_fret_noteskma1y.pdfIn PDF document text
    • http://lestyprin.online/jack_lalanne_power_juicer_ultimate_partsuhkdo.pdfIn PDF document text
    • http://xapowuxif.mywebcommunity.org/58001428716.pdfIn PDF document text
    • http://lasleymarkt.ru/rikomomr1in.pdfIn PDF document text
    • http://itawomen.fun/supply_chain_management_a_global_pernxyja.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gafodix.myartsonline.com/farmer_boy_book_summary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/453d5c05-3eab-4a87-bd32-ba9596df741c/graco_modes_duo_double_stroller_-_duke.pdfIn PDF document text
    • https://1e16da7b-5b4f-4122-a3c4-5c88c9d97cf7.filesusr.com/ugd/83f04e_118421f23f554a148b97ac23d804e382.pdf?index=trueIn PDF document text
    • https://57eba762-b826-4879-8d7a-7f480aba2934.filesusr.com/ugd/e89c2b_58c49db8fb4b4472a706378cdf11fc84.pdf?index=trueIn PDF document text
    • http://namepafubi.atwebpages.com/whirlpool_cabrio_washing_machine_wont_spin_or_drain.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8e4e2d03-1aa6-4dca-9518-acbd4589556b/frigidaire_gallery_refrigerator_top_ice_maker_not_working.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e7c21a5c-d741-4e70-939b-fce72f115cf8/nixil.pdfIn PDF document text
    • http://satawakerexe.atwebpages.com/94598465274.pdfIn PDF document text
    • https://ab60d57a-1f92-408f-9079-0b325776b613.filesusr.com/ugd/724fb5_21f9beb509db43aa8863b584de3820cf.pdf?index=trueIn PDF document text
    • https://aa6d2f86-95e2-42cc-897e-6bbd71c3a116.filesusr.com/ugd/78daac_5294258cb9474a56a3abd6ad9db52ddc.pdf?index=trueIn PDF document text
    • http://nixomirorubu.myartsonline.com/holy_quran_written_in_arabic_free_download.pdfIn PDF document text
    • https://e9abb47e-19e5-4ec2-9f3c-2aa4e6f2bf0a.filesusr.com/ugd/92be99_efa3303fb47544c6a55028af31409044.pdf?index=trueIn PDF document text
    • https://72a23b54-95c1-47c0-80d6-f7b1310faeb8.filesusr.com/ugd/65b209_1e32c0b9c3964a5c953b26d5b4b2eed7.pdf?index=trueIn PDF document text
    • https://680b96f7-c70a-468b-a697-68638c24dfdb.filesusr.com/ugd/d55797_e55baf2fd38e4d0498fb6e67fa9ca929.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5cce26cd-a332-479b-831d-649e65e2d9c9/rainbow_vacuum_store_near_me.pdfIn PDF document text
    • https://b2d1eea7-aef5-47fc-962c-88b5513ecafc.filesusr.com/ugd/3a57bc_05e06f7c850c41c4a8836674e5c3be1a.pdf?index=trueIn 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_off0000ed30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED30 5820 bytes
SHA-256: d80dd2dc27d4e355695548e62ccfd9249946380b29066d7e2889f1e84b6a7a84
font_01_sfnt_off000100fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100FD 11308 bytes
SHA-256: c9afa9297216ab77ec4c3dc7705a4e0f19ca0d8c255069cbc082c4b5864f5853

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