Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5e646f88ecdb2eb…

MALICIOUS

PDF

76.2 KB Created: 2021-03-31 12:32:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: e194a1aa77fddf2cbf00c3e51e933873 SHA-1: c4ea813af736bee07822acbca8405d8b845dafdb SHA-256: c5e646f88ecdb2eb41606ae3c8618065a95a3e875415163e1b4e8f556abaf4df
126 Risk Score

Malware Insights

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

The file is a PDF that contains numerous embedded URLs, many of which point to disposable domains and are flagged as part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of external URIs and the nature of the embedded links suggest an attempt to redirect the user 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://seumenha.ru/award?keyword=evidence+chain+of+custody+pdf PDF link annotation
    • http://topcreditmonitoring.info/42175506106p83nk.pdfIn PDF document text
    • http://misifebofol.mywebcommunity.org/longman_toefl_paper_test_download.pdfIn PDF document text
    • http://revilokepudidu.mygamesonline.org/64998055540.pdfIn PDF document text
    • http://andyhong.blog/black_powder_reloading_manualt37wm.pdfIn PDF document text
    • http://outputqwvk.space/analyzing_numerical_data_validating_identification_numbers_answer_keyx8ysn.pdfIn PDF document text
    • http://netzamka.ru/exercices_pour_apprendre_le_franaisb2wwj.pdfIn PDF document text
    • http://igclienteam.com/bopixozuduvisaja8al3n.pdfIn PDF document text
    • http://classkaod.ru/98415146872qmaeo.pdfIn PDF document text
    • http://dotavulilego.mypressonline.com/futetabeligapeminufo.pdfIn PDF document text
    • http://changepass.online/ukulele_strumming_patterns_4_4d4fg6.pdfIn PDF document text
    • http://rulabepotinujeb.mypressonline.com/vipukuzewepunigorew.pdfIn PDF document text
    • http://cucoupon.info/jopeduwuzuwativavizi3yyn.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://2e4b0ed6-c237-476e-b23b-7c95f147629f.filesusr.com/ugd/30e930_961f5e741a874c389a88748836287195.pdf?index=trueIn PDF document text
    • https://fbaba6ab-37cf-477f-82bd-e10a416eccda.filesusr.com/ugd/3c8574_59b50ef291fa4176969b21d928d8623f.pdf?index=trueIn PDF document text
    • http://donijexufenu.onlinewebshop.net/58581274879.pdfIn PDF document text
    • https://7ed754b6-a209-4558-9281-0032c7ee8ade.filesusr.com/ugd/4329d7_2d30efc92a7a4b6d9c89a160f338d25e.pdf?index=trueIn PDF document text
    • https://e2a12503-e9f4-4898-9b1e-00959bf5a9c8.filesusr.com/ugd/1f0de7_e42943c535c7429ab7b4e2af26572d26.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_off0000eeba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEBA 5232 bytes
SHA-256: 3a425ffc088e48cec325c99fd0d9dede60e82a0f9738306fcf3d7f53135b3063
font_01_sfnt_off000100a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100A6 10240 bytes
SHA-256: 56e5a884b48f2b8e3ebbdd7b7af7366ab1a622cbb332774ed270dbb7135406c6

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