Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3bdccb356d7c6a2…

MALICIOUS

PDF

68.7 KB Created: 2021-02-16 06:57:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: aedead4b8d94e7ab6e284f877ed75032 SHA-1: cc7468869fedde955342b54472bec2563d19f2f8 SHA-256: b3bdccb356d7c6a2c2ae083ee4bb78dbe1fdd54aa8f459f6467ac71e10bb3985
126 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous embedded URLs pointing to a link farm hosted on disposable domains, suggesting a tactic for SEO manipulation or to distribute further malicious content. The presence of external URIs and the link farm structure strongly suggest a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://druttle.ru/wix?keyword=ozymandias+poem+question+answers PDF link annotation
    • http://trelon.fun/79713858276rcpyv.pdfIn PDF document text
    • http://everydays.space/bahnschrift_condensed_bold_fonth6dpt.pdfIn PDF document text
    • https://merugerizun.weebly.com/uploads/1/3/4/3/134337850/b0815b8eeb08a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403539/normal_601867ac85756.pdfIn PDF document text
    • http://rebujewemiv.66ghz.com/answer_question_24_impossible_quiz.pdfIn PDF document text
    • http://indital.space/nexigajixifoqu93.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492555/normal_600dabfdd695c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366009/normal_6005d9cf52adb.pdfIn PDF document text
    • http://apparentlyopt.com/can_i_convert_a_to_word_on_my_ipadqw217.pdfIn PDF document text
    • https://lokesikaneweb.weebly.com/uploads/1/3/1/4/131437695/giwigowinar.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389085/normal_5fcaa4e25508e.pdfIn PDF document text
    • https://veguxalefimas.weebly.com/uploads/1/3/1/3/131382166/8b6c2a5a2dd61.pdfIn PDF document text
    • https://noxigizafovezad.weebly.com/uploads/1/3/1/4/131438329/d7a827ae65f366.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://malinaliwul.epizy.com/27863387995.pdfIn PDF document text
    • http://wekidezeze.epizy.com/blackmart_apk_2018_v2._16.pdfIn PDF document text
    • http://bufafaloverodi.rf.gd/20189194752.pdfIn PDF document text
    • http://sobuzazan.rf.gd/autogenes_training_formelhafte_vorsatzbildung.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_off0000d01d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD01D 5472 bytes
SHA-256: 3c8a798318e5fffcc354fc21ea4d09efcf442181ca70095a6447ce328556fa10
font_01_sfnt_off0000e2b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2B5 10420 bytes
SHA-256: e0e267a5e2200113c152f6d789e7a6d23dccfb9cf390638a081c3c6303953748

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