Malicious PDF — malware analysis report

Static analysis result for SHA-256 da911d6499bddc43…

MALICIOUS

PDF

72.6 KB Created: 2021-01-19 22:55:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: e8a6c146f0414d5ca6ce4b2f800348bf SHA-1: e43247d226224e5ec183ffb57f6235d2dd35cca0 SHA-256: da911d6499bddc439384d4744f829e810cd73233fd8afc10a41ec55e9771eb78
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, with one specifically identified as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious sites.

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://traffking.ru/123?utm_term=cry+baby+bridge+doylestown+ohio PDF link annotation
    • https://site-1174929.mozfiles.com/files/1174929/90701622563.pdfIn PDF document text
    • https://cdn.sqhk.co/silinetufid/JWgeuif/umc_hospital_pay_bill.pdfIn PDF document text
    • https://cdn.sqhk.co/mazavanov/PifQjdB/sea_chest_size_calculator.pdfIn PDF document text
    • https://site-1178100.mozfiles.com/files/1178100/dragon_city_hack_gems_download.pdfIn PDF document text
    • https://cdn.sqhk.co/lituxopevuk/hiqHvhe/puzzle_100_level_30.pdfIn PDF document text
    • https://cdn.sqhk.co/miwizawi/Y7USgcW/pubavidiju.pdfIn PDF document text
    • https://site-1167941.mozfiles.com/files/1167941/jedevuviboperomibozewo.pdfIn PDF document text
    • https://cdn.sqhk.co/pesuxitum/q7eIjeY/growtopia_download_apk_ios.pdfIn PDF document text
    • https://cdn.sqhk.co/sezogitov/giadMOu/offline_business_game_mod_apk_download.pdfIn PDF document text
    • https://cdn.sqhk.co/lejesapazud/68ZGg9T/frosty_words_answers_level_3.pdfIn PDF document text
    • https://site-1173611.mozfiles.com/files/1173611/17518321361.pdfIn PDF document text
    • https://cdn.sqhk.co/gawagunikuw/n4icxsx/pifuvet.pdfIn PDF document text
    • https://site-1244768.mozfiles.com/files/1244768/dunoge.pdfIn PDF document text
    • https://cdn.sqhk.co/fefuxumito/DA32Khb/smart_belize_phone_directory.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/polojuliragam/48671535008.pdfIn PDF document text
    • http://bawavejukedosuv.epizy.com/sijutixedudalexanenerujil.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_off0000dfc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFC6 5324 bytes
SHA-256: cec5dd3a80add11cdc5317209ec5125f7c3c1135a97470c5de2fe5790f3be27c
font_01_sfnt_off0000f1eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1EB 10324 bytes
SHA-256: 8a9d3a80d5cd30990a66a0568d2a2547462ca1129b2abd883d53538bd06b9a37

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