Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1b105db1065482d…

MALICIOUS

PDF

85.5 KB Created: 2021-02-26 12:17:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 015556555e255d5e033c7738d952a82b SHA-1: b841ade02fb0660cb15923ec396817d5de7ba1d8 SHA-256: a1b105db1065482d38926e648245fd01368ed1f6b9b6ff54618f06b7ade67f49
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting it is part of an SEO spam or phishing campaign. The document body, though heavily obfuscated, contains keywords related to product maintenance, likely used as lures.

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
  • 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://jacksth.ru/wb?keyword=saeco%20odea%20giro%20maintenance%20kit PDF link annotation
    • https://cdn.sqhk.co/gebemiwisero/jeGdjdU/latest_samsung_galaxy_s9_ringtone_length.pdfIn PDF document text
    • https://cdn.sqhk.co/pamavunawi/jfQgfjd/exoplanet_discoveries_since_2015.pdfIn PDF document text
    • https://cdn.sqhk.co/gosukutusu/jbZiavN/jopuxediduse.pdfIn PDF document text
    • http://sarepoxorak.22web.org/horizon_bcbs_member_appeal_form.pdfIn PDF document text
    • https://cdn.sqhk.co/dikulodut/EjhpDZZ/running_warehouse_coupon_codes_not_working.pdfIn PDF document text
    • http://golixudib.mypressonline.com/heat_and_mass_transfer_fundamentals_and_applications_6th_edition.pdfIn PDF document text
    • https://zobezefifoluza.weebly.com/uploads/1/3/5/3/135306737/4bdfe788ac.pdfIn PDF document text
    • https://janusizexagelu.weebly.com/uploads/1/3/5/3/135337128/lexoniwuwajed.pdfIn PDF document text
    • https://xatotaga.weebly.com/uploads/1/3/4/7/134726025/66285da413f853.pdfIn PDF document text
    • https://cdn.sqhk.co/lukulugere/jj3mYgh/train_sim_world_2020_ps4_dlc.pdfIn PDF document text
    • https://vanoxurele.weebly.com/uploads/1/3/1/6/131606202/mapakudavawar_gokabivesisew_bomojulumizemop.pdfIn PDF document text
    • https://cdn.sqhk.co/remezebona/wjaie5P/nail_art_supplies_wholesale.pdfIn PDF document text
    • http://wezutos.iblogger.org/rinitopogopimu.pdfIn PDF document text
    • https://cdn.sqhk.co/momewoziwoge/Ohghc4k/jebozewilugikoxududave.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://lisevazoni.rf.gd/chevrolet_cruze_2010_owners_manual.pdfIn PDF document text
    • http://zurutoraxavifes.rf.gd/76844766128.pdfIn PDF document text
    • http://pisironebininuw.rf.gd/69545919821.pdfIn PDF document text
    • http://vejaxuka.epizy.com/36306011370.pdfIn PDF document text
    • http://bekonoxidolu.rf.gd/fawitizokekegezomubuvani.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000103a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103A9 5004 bytes
SHA-256: 50e4182514f027941143f7f7d27e5c59f8a032c80e1824d1c685d574b0443aba
font_01_sfnt_off0001147f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1147F 11008 bytes
SHA-256: 5e14a70d242c8448d5a0a157a056808a1a98b79fc9498a8caed4a9c1ad8f3bae
font_02_sfnt_off00013a39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A39 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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