Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd84e220432f5aa5…

MALICIOUS

PDF

85.1 KB Created: 2021-04-11 14:09:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: d2544e43e82be6ab1ff372ed143f0441 SHA-1: c7dafd95728386f24d6f494ecb45f4da1c78fb6e SHA-256: cd84e220432f5aa5677037e7aa4f8cc500c4a7da981d23bc926b6d60cce05f22
196 Risk Score

Malware Insights

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

The PDF contains a lure related to Mexican holidays, directing users to a URL that appears to be an SEO redirector. This redirector then points to another URL, likely for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent, and the PDF structure suggests it's designed to trick users into visiting external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://jumiwimov.ru/strik?utm_term=cuales+son+los+dias+feriados+por+ley+en+mexico PDF link annotation
    • https://teworovesub.weebly.com/uploads/1/3/0/7/130775402/9788187.pdfIn PDF document text
    • http://bcpreactiva-enlinea.com/kinojesapokidinowini6dzlh.pdfIn PDF document text
    • http://nunegotopexipo.iblogger.org/auriculotherapy_manual_terry_oleson.pdfIn PDF document text
    • https://dojunulopifo.weebly.com/uploads/1/3/4/4/134445836/68471efd4dbd80.pdfIn PDF document text
    • http://pesuzukotejoki.iblogger.org/66280380869.pdfIn PDF document text
    • https://ruxesewafemowur.weebly.com/uploads/1/3/4/7/134761388/54c81a.pdfIn PDF document text
    • http://pe50off.info/financial_and_managerial_accounting_for_mbas_5th_edition_cheggh4crw.pdfIn PDF document text
    • http://zedukibawubige.22web.org/77879587331.pdfIn PDF document text
    • http://kostlike.site/wilaxutegu8zvja.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/lolijexejomak/75450045844.pdfIn PDF document text
    • https://s3.amazonaws.com/ganubatebedoxez/what_do_godparents_have_to_do_at_a_catholic_baptism.pdfIn PDF document text
    • https://s3.amazonaws.com/lofese/sobejafuxawobaru.pdfIn PDF document text
    • https://s3.amazonaws.com/lixuzo/android_16_vs_cell_jr.pdfIn PDF document text
    • http://duxawunofuror.epizy.com/dictionary_english_to_punjabi.pdfIn PDF document text
    • https://s3.amazonaws.com/xojafemori/wifi_signal_booster_free_for_laptop.pdfIn PDF document text
    • http://kojomazudogog.epizy.com/test_past_simple_and_continuous.pdfIn PDF document text
    • https://s3.amazonaws.com/vefagotoje/kosefuruvure.pdfIn PDF document text
    • http://muberugaguto.epizy.com/sutisifigewimu.pdfIn PDF document text
    • https://s3.amazonaws.com/tuxenipup/xuxobafesijakubanebavenur.pdfIn PDF document text
    • http://lulikeleweworup.epizy.com/nesegigiromoramut.pdfIn PDF document text
    • http://wapolijo.epizy.com/mary_shelleys_frankenstein_full_movie_download.pdfIn PDF document text
    • https://s3.amazonaws.com/woneketelak/chopsticks_movie_hd.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
    • 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
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f956.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF956 6744 bytes
SHA-256: 127b44c9f93874c96d25eb7ddc4688780d8877ce931cf296363fb5748d8d514b
font_01_sfnt_off00010a3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A3D 5376 bytes
SHA-256: 02eb8cf2c0579e5770df2c061aff12033cb06deef75f182a04478ffde634a1f9
font_02_sfnt_off00011c7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C7E 12248 bytes
SHA-256: bbf11ab2655e34569065b214b40ba932c3d35c591fc7cace3830edce060ce78b