Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1a4593c4e9b9637…

MALICIOUS

PDF

88.1 KB Created: 2021-03-27 17:37:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 47a767de851348fb1de2c2192524dc6a SHA-1: 77896a3add3a371f9ba41de08e5d2337abffb98a SHA-256: f1a4593c4e9b9637fe77f60dd63a5af0b4ebd639e2e71f63afd0d1cfb9b92921
126 Risk Score

Malware Insights

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

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous external URIs, with a significant number pointing to disposable hosting, suggesting a link farm designed to redirect users to potentially malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags this behavior. While no scripts were extracted, the presence of embedded URLs and the overall structure strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 5

  • 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 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://xezojetit.ru/award?keyword=asparaginase+enzyme+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4392861/normal_6042d2790f15b.pdfIn PDF document text
    • https://cdn.sqhk.co/nigudovowa/wRhchcA/bernards_high_school_athletic_forms.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495860/normal_6023ce1e7e084.pdfIn PDF document text
    • http://phtech.site/cuales_son_los_verbos_regulares_en_ingles_ejemploscmge5.pdfIn PDF document text
    • http://50off.pro/47749306388yjbz0.pdfIn PDF document text
    • http://glasshookahcatering.com/autocad_command_bar_missinglwi61.pdfIn PDF document text
    • https://cdn.sqhk.co/kagaxavog/0hhibgh/32555279337.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413866/normal_5fc929a37d83f.pdfIn PDF document text
    • http://teren.fun/among_us_lock_screen_live_wallpaperr5zdf.pdfIn PDF document text
    • https://cdn.sqhk.co/rajemaramiw/SA6Xhgq/mobi_world_ryk.pdfIn PDF document text
    • https://cdn.sqhk.co/moviferu/vMjbjaq/pogaguzobisavetiginabo.pdfIn PDF document text
    • https://cdn.sqhk.co/vakolitakap/wjghdji/escaping_the_prison_2_games_free_online.pdfIn PDF document text
    • http://kostlike.site/wivaxalqe9d4.pdfIn PDF document text
    • http://idealicaitalia-ufficiale.site/is_wealth_tax_good6vc0e.pdfIn PDF document text
    • http://vinnipoh.fun/almighty_god_my_redeemer_lyricsure93.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wupigokoravu.epizy.com/fibinij.pdfIn PDF document text
    • https://s3.amazonaws.com/ropidadegaxut/koboj.pdfIn PDF document text
    • http://fiwusinuba.rf.gd/xejeket.pdfIn PDF document text
    • https://s3.amazonaws.com/sorogamat/letagaludobofuwexadep.pdfIn PDF document text
    • http://jinujatafariva.rf.gd/19814175149.pdfIn PDF document text
    • http://vugapadilubokis.epizy.com/53210449661.pdfIn PDF document text
    • https://s3.amazonaws.com/joterige/2068397632.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010356.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10356 5472 bytes
SHA-256: 8eb004718759a6d0c6635fdfbf82a028c4535c3ee412b6c4646640b4c5637fe2
font_01_sfnt_off000115f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115F4 11620 bytes
SHA-256: b22c0cf069cc51b0e4e7351981884cd8d2fdc4278568359003eeb514533688c3
font_02_sfnt_off00013d42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D42 16160 bytes
SHA-256: f80b9f84d6ea16074f67da7a904ab41e14e5a44612b81a97f195d72f9bd2a496

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