Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee1d4f9ccb0fa456…

MALICIOUS

PDF

77.5 KB Created: 2021-05-05 05:16:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 1f4e7bc47b67540f4fb66526a4c28a5a SHA-1: e7bf8c3a43b548c2a9b4f86305655866fb912f60 SHA-256: ee1d4f9ccb0fa456ffa3ea994b5a82eb614e1565591ed987fd4149272a63cd4b
126 Risk Score

Malware Insights

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

The PDF contains multiple external URIs, with a significant number pointing to disposable hosting and employing UTM parameters, indicative of a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. Although no scripts were extracted, the structure and URL patterns point towards a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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/strik?utm_term=brood+war+cheat+codes PDF link annotation
    • http://farvestnn.ru/how_to_play_the_saxophone_alto036sd.pdfIn PDF document text
    • http://ca-manalapan.space/acapella_preset_fl_studiodthd6.pdfIn PDF document text
    • http://bonifacy.site/disneyland_resort_map_2020nuwgm.pdfIn PDF document text
    • http://aires.fun/star_trek_the_next_generation_season_3_episode_15scof2.pdfIn PDF document text
    • http://yudekor.ru/samoridagotekitusaznes.pdfIn PDF document text
    • http://italywow.info/kuvepalozuganujiduloz4j8h.pdfIn PDF document text
    • http://reassurez-moi-fr.info/81400561349zkqxm.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426816/normal_5ff88bb9c6329.pdfIn PDF document text
    • http://kittyplay.online/the_full_armour_of_god_bible_verse2luhm.pdfIn PDF document text
    • http://volamejabevakik.22web.org/kazotitagomajenugo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402261/normal_6052b80aad277.pdfIn PDF document text
    • http://boost-shop.xyz/642543939973dir.pdfIn PDF document text
    • http://rodopopenusunuv.iblogger.org/luwafitufap.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/ponivotigegepub/what_is_the_fugl_meyer_assessment.pdfIn PDF document text
    • http://rimamosapike.epizy.com/nesirum.pdfIn PDF document text
    • https://s3.amazonaws.com/tujeviwakirawu/53468431062.pdfIn PDF document text
    • http://vaxalisuj.rf.gd/fexoso.pdfIn PDF document text
    • https://s3.amazonaws.com/jusuberu/root_android_using_linux_terminal.pdfIn PDF document text
    • https://s3.amazonaws.com/netinuwa/siwaxub.pdfIn PDF document text
    • https://s3.amazonaws.com/zerejibixupav/the_secret_dare_to_dream_full_movie_in_india.pdfIn PDF document text
    • https://s3.amazonaws.com/loxopudizus/nc_state_online_computer_programming_certificate.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF42 5136 bytes
SHA-256: 54b4953c2c644eb22504618c55653a8e73f71da20fd6c64e5188f909064186ab
font_01_sfnt_off000100c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100C5 11680 bytes
SHA-256: c997bb72a3f79fbce70b13d16ad773aa26796a6e4f5eb6c08717347e232e80c7

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