Malicious PDF — malware analysis report

Static analysis result for SHA-256 2749396843b4736b…

MALICIOUS

PDF

104.1 KB Created: 2021-03-03 20:18:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 6c1f33d636020f3cdefa9a0c39effef1 SHA-1: de74d8e313950f0ef3ddad8ddcf11e3274f1a193 SHA-256: 2749396843b4736b1b8fad95e7d86efe5cc5aaa8dfa182f6a2521439e786e9be
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing lure. The document body, though heavily obfuscated, contains text related to 'Tipos de sistemas dispersos en la basura' which is likely a keyword to attract search engine traffic. The presence of PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics, along with a high ML confidence score and ClamAV detection, indicates malicious intent, likely to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://jottigo.ru/award?keyword=tipos+de+sistemas+dispersos+en+la+basura PDF link annotation
    • https://cdn.sqhk.co/xavonepez/ggcicgd/webunejuxadeluwademefegek.pdfIn PDF document text
    • https://ruzuwigowan.weebly.com/uploads/1/3/1/4/131453288/tufoka.pdfIn PDF document text
    • https://cdn.sqhk.co/jimumakevaji/jgjbxY2/rock_band_guitar_hero_cross_compatibility.pdfIn PDF document text
    • https://cdn.sqhk.co/pugudanirav/dnQIkjg/golden_boot_2020_premiership.pdfIn PDF document text
    • http://yandex-dostav.ru/62408550101ndyyo.pdfIn PDF document text
    • https://cdn.sqhk.co/vapatibu/hcV9igp/serimipatufato.pdfIn PDF document text
    • https://cdn.sqhk.co/fabozesemi/aXVQthc/can_i_apply_paint_protection_film_myself.pdfIn PDF document text
    • http://mynasert.online/army_whatsapp_status_video_songkvv66.pdfIn PDF document text
    • https://luvofebujapima.weebly.com/uploads/1/3/0/9/130969865/joferitusu.pdfIn PDF document text
    • http://wildber.store/xevefuxazetimepofinekojegs67du.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/gebukil/53969495792.pdfIn PDF document text
    • http://laxiwezemew.epizy.com/understanding_regression_analysis.pdfIn PDF document text
    • http://kewivifonawati.epizy.com/bezidifonajuwowobito.pdfIn PDF document text
    • http://lepugip.epizy.com/bopakato.pdfIn PDF document text
    • https://s3.amazonaws.com/wazorixekunafob/jatizifisut.pdfIn PDF document text
    • http://puteroxono.epizy.com/sketchup_pro_2019_crack_free_download_softonic.pdfIn PDF document text
    • http://tokipobobanokab.rf.gd/kitchenaid_stove_top_oven_not_working.pdfIn PDF document text
    • http://sibovup.epizy.com/mawl_laser_vs_peq_15.pdfIn PDF document text
    • http://libiwozurogufo.rf.gd/78652532797.pdfIn PDF document text
    • http://bividit.rf.gd/renidivowoz.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011839.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11839 5196 bytes
SHA-256: 345f33949f54482628397957e1b68c8967a632ee19d197b1bf23ed98e989e739
font_01_sfnt_off000129b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129B9 2256 bytes
SHA-256: 6b24c8aacef74fc492fa3071688f7d37960e29013b2c17f1c7a5246635f1e510
font_02_sfnt_off00013342.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13342 18008 bytes
SHA-256: c3e588b8e7c8920e0aed30b40dd2d67e00d5636285011b5c35ae408b98885d3d
font_03_sfnt_off000168dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x168DC 16572 bytes
SHA-256: 112a89920db1e4edb9058a90e3f25af92782ee66122c6707181d0b79a473c4c7
font_04_sfnt_off00017f82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17F82 6516 bytes
SHA-256: a573be68914b930f95ab08e7879423e8681b6ade9e7e8468cd5b5a0726546814

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