Malicious PDF — malware analysis report

Static analysis result for SHA-256 e40bddac510970a5…

MALICIOUS

PDF

73.0 KB Created: 2021-01-15 04:38:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 83949fa54fc237cf97f889534fc88704 SHA-1: bce8f1d8c7d37b0608d739a859b05950ec44b3e2 SHA-256: e40bddac510970a5b864e1e3bc1acfff90d7518687eb859f3587b6f685ab9b16
184 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to known malicious infrastructure, specifically identified as a redirector for phishing or malware distribution. The heuristic firings indicate the PDF is designed as a link farm on disposable hosting, aiming to trick users into downloading potentially harmful content. While no scripts were explicitly extracted, the nature of the links and the ML classifier output strongly suggest a malicious intent to redirect users to malicious 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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://ggtraff.ru/aws?utm_term=shareit+software++for+windows+xp In PDF document text
    • https://site-1168171.mozfiles.com/files/1168171/85653069096.pdfIn PDF document text
    • https://cdn.sqhk.co/sebutarukaw/G3wiejf/ark_survival_evolved_pc_download.pdfIn PDF document text
    • https://site-1171776.mozfiles.com/files/1171776/dharma_chakram_telugu_movie_ringtones.pdfIn PDF document text
    • https://site-1242663.mozfiles.com/files/1242663/overleaf_academic_cv_template.pdfIn PDF document text
    • https://cdn.sqhk.co/kaxovugefulo/cy3jjib/41073235747.pdfIn PDF document text
    • https://cdn.sqhk.co/lamifiriluz/wSVoGha/95236833481.pdfIn PDF document text
    • https://site-1168410.mozfiles.com/files/1168410/mastercard_airport_experiences_review.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402280/normal_5fbe58a0e7c8a.pdfIn PDF document text
    • https://site-1249947.mozfiles.com/files/1249947/flightless_bird_american_mouth_piano_sheet_music.pdfIn PDF document text
    • https://site-1174866.mozfiles.com/files/1174866/stick_war_legacy_2_mod_apk_hack.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/liwafo/9664835734.pdfIn PDF document text
    • https://s3.amazonaws.com/nowonovege/cranium_crunches_brainy_words_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/jedobufudajewu/11165094139.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_off0000e1b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1B3 5360 bytes
SHA-256: 22f24448d9e74f26ed819c2d7df4231e7fa1fe152e14ac47cb13b55805a86a57
font_01_sfnt_off0000f3ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3FF 10512 bytes
SHA-256: 5a61eee8ba4946eb91fc3c4ad89805fb98c8796397f9f33adc3780479784847c

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