Malicious PDF — malware analysis report

Static analysis result for SHA-256 a23f323970f28bf7…

MALICIOUS

PDF

73.2 KB Created: 2021-03-10 08:04:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 43c50b4ed11e6a364a70eb6080b0ebbe SHA-1: 97c3a6f48183024c365b2e4dd40813fcc0640892 SHA-256: a23f323970f28bf79c24f9bcf6d787e70e04182a81756961f5bae14828726b7c
156 Risk Score

Malware Insights

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

The PDF document contains numerous external links, many of which are hosted on dynamic DNS services or free hosting platforms, suggesting a link farm or phishing operation. The heuristic PDF_SEO_LINK_FARM firing indicates a large number of external PDF links were generated, likely to manipulate search engine results. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://ponafet.ru/wix?keyword=flights+from+baltimore+to+charleston+sc PDF link annotation
    • https://fexagire.weebly.com/uploads/1/3/0/7/130775556/bedur.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501503/normal_6027d97446d9f.pdfIn PDF document text
    • http://rentline.pro/toyota_production_system_bookrnenl.pdfIn PDF document text
    • https://finijigif.weebly.com/uploads/1/3/2/6/132681422/fijame.pdfIn PDF document text
    • https://tasuvoni.weebly.com/uploads/1/3/4/6/134690764/nuwopi.pdfIn PDF document text
    • http://fbcopyright-center.com/algebra_nation_workbook_answers_section_1dv05m.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483842/normal_602f4b592c833.pdfIn PDF document text
    • https://wexubowepupewaw.weebly.com/uploads/1/3/1/8/131856394/zanuz.pdfIn PDF document text
    • https://taxurazuzar.weebly.com/uploads/1/3/4/0/134042721/bapidajam.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458849/normal_601bbe8d2c422.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/luworizesupox/libiduvawajewusiguvokenej.pdfIn PDF document text
    • https://s3.amazonaws.com/devuxuzejozam/97468397811.pdfIn PDF document text
    • https://f6ce3cfb-f922-470c-9e0e-eaf724001b0e.filesusr.com/ugd/defcb2_94fca436ce8e4988956e40a571bed895.pdf?index=trueIn PDF document text
    • https://9e2bb560-353e-4f5d-a08b-1363560edab4.filesusr.com/ugd/6c032c_43392dfaabff402aa20c6e39b8d613ae.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/luxaduzimase/96314447.pdfIn PDF document text
    • https://b304dada-1952-41b2-af44-d16a3232bb3f.filesusr.com/ugd/c19c34_68464aeb3bf142528f5e67e7c1a53cba.pdf?index=trueIn PDF document text
    • https://234a0c07-d908-4261-bb83-16b3c96a9b04.filesusr.com/ugd/73e0e6_85bb69d31c4b4e2f99e4cc8aa49bd895.pdf?index=trueIn PDF document text
    • https://57933e30-1e86-4cbe-ad2b-777cb72f9932.filesusr.com/ugd/235f1a_503d01083a6f4301864edf1096ee31de.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/legapatatezisa/stanford_bookstore_computer_price_list.pdfIn PDF document text
    • https://dbba0f06-1911-40f0-8c80-a2638c7f81cc.filesusr.com/ugd/b13fd1_08572b8a75984e5182600521ac6aba49.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/ditiruz/153705839.pdfIn PDF document text
    • https://4abf464d-34d5-4c80-8de5-e64f30e04530.filesusr.com/ugd/8b3eb5_b8805066c7b94a0a8766ed582afc95e8.pdf?index=trueIn 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_off0000e129.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE129 5392 bytes
SHA-256: ece3a6f30dbab7b5b0e35da46b5b50503f55b9f4e35c2cbc2d1b221fbe559f5a
font_01_sfnt_off0000f357.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF357 10500 bytes
SHA-256: 3106e476a007866268c9457ea65b0ba9d069482d2c2f80d0076f6f4615ec6d82

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