Malicious PDF — malware analysis report

Static analysis result for SHA-256 3058ed8b3638dff8…

MALICIOUS

PDF

76.5 KB Created: 2021-01-11 23:41:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 9f3266b95c0c81770a7d6ddc62a5ac2e SHA-1: 8db0991ec3d428dd37784aa40859b8c5ee83f139 SHA-256: 3058ed8b3638dff819cbcb3b1e128973e6c32dfa7a116d728bb219ade6026a8e
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high probability of malicious intent. It contains numerous embedded URLs pointing to potentially malicious sites, disguised under seemingly legitimate document titles. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests these URLs are part of a link farm designed for malicious redirection. No scripts were extracted, but the presence of multiple external URIs strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://trafficel.ru/aws?utm_term=azitromicina+bula+profissional+pdf PDF link annotation
    • https://site-1185553.mozfiles.com/files/1185553/toca_life_town_apkpure.pdfIn PDF document text
    • https://site-1198033.mozfiles.com/files/1198033/business_management_degree_online.pdfIn PDF document text
    • https://cdn.sqhk.co/vekuperik/jh5Qjat/louis_vuitton_mini_speedy_multicolor_black.pdfIn PDF document text
    • https://site-1173632.mozfiles.com/files/1173632/driving_school_2017_mod_apk_unlimited_money_revdl.pdfIn PDF document text
    • https://site-1177512.mozfiles.com/files/1177512/xidakila.pdfIn PDF document text
    • https://cdn.sqhk.co/sepovili/yMuOijx/hoop_swish_gif.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411503/normal_5fa16275245c3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369343/normal_5fd779959fa4e.pdfIn PDF document text
    • https://site-1168081.mozfiles.com/files/1168081/71358030206.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/dutuzanob/recompile_app_for_arm.pdfIn PDF document text
    • https://s3.amazonaws.com/bisegilupuf/naruto_senki_mod_anime_war.pdfIn PDF document text
    • https://s3.amazonaws.com/wukevirenesu/free_colour_by_numbers_sheets.pdfIn PDF document text
    • https://s3.amazonaws.com/jepinebawo/bikozubakadiziwatiwava.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_off0000ed55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED55 5480 bytes
SHA-256: 3a7f8cff4a3eb8a6c3fdbd8c8fc9b59be274f3f9b0db0e6c6e1c65c10fb10773
font_01_sfnt_off0000ffe4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFE4 10920 bytes
SHA-256: 4bd105fac46a214010a51f592bef8c25b36cf33969156a1d5f606a889adf23fc

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