Malicious PDF — malware analysis report

Static analysis result for SHA-256 643838fc535f1baa…

MALICIOUS

PDF

74.5 KB Created: 2021-03-15 22:33:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-13
MD5: f8a41f11a9c3fa4c797df6d047c2f4b1 SHA-1: 99b34e7dd8490e66b070f03c51e03b048cfd602b SHA-256: 643838fc535f1baaa5f597fc775a6d6336ca5b99a9da6d011a46582466edd839
156 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded external links, a common tactic for phishing or distributing malware. The heuristic PDF_SEO_LINK_FARM specifically indicates a link farm, suggesting a malicious intent to drive traffic to potentially harmful sites. The ML classifier and ClamAV detection strongly support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 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://xezojetit.ru/wix?keyword=asm+study+manual+exam+fm PDF link annotation
    • https://gidixelasulam.weebly.com/uploads/1/3/0/7/130739099/2711c.pdfIn PDF document text
    • https://cdn.sqhk.co/zogaxokeno/gfjgy2X/centurylink_outage_map_mesa_az.pdfIn PDF document text
    • https://fatilisuwojumo.weebly.com/uploads/1/3/4/6/134652656/1208628.pdfIn PDF document text
    • https://cdn.sqhk.co/jawubibegeba/iJGjdiq/48073599616.pdfIn PDF document text
    • https://cdn.sqhk.co/lofakekaf/ifibyhb/conspiracy_theory_mel_gibson_netflix.pdfIn PDF document text
    • https://cdn.sqhk.co/vifamepupib/9MTz4X2/79572971817.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/rodiligarexo/aparato_circulatorio_corazon.pdfIn PDF document text
    • https://s3.amazonaws.com/fusidejebi/c_member_function_template_parameters.pdfIn PDF document text
    • https://s3.amazonaws.com/jovekus/tepezuwadozokemum.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1d47c1d5-6c11-4955-acb6-52e4d31d6fe8/sony_hdr-as200v_firmware_update.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5dacfc25-76d7-43be-81f6-09b30b8b1df8/casio_g-shock_ga-1100-1a1er_gravitymaster.pdfIn PDF document text
    • https://s3.amazonaws.com/libeganot/70426045936.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/778ee87e-9873-4e5c-89f5-7e701465a4ac/articles_in_english_grammar_exercises_with_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/resisuna/61151718587.pdfIn PDF document text
    • https://s3.amazonaws.com/wogikokuzotaxa/sasol_bursary_2020.pdfIn PDF document text
    • https://s3.amazonaws.com/wewiro/36899600314.pdfIn PDF document text
    • https://s3.amazonaws.com/lijopavexanuse/53117399393.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3ab9ae1a-df38-4a78-8203-90faa5c013ba/lenoxogesin.pdfIn PDF document text
    • https://s3.amazonaws.com/mukut/befimimivuxonimowosi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/71cff21d-d765-479b-bca4-3aaf2ae7c1ce/the_giver_discussion_questions_chapter_11_15.pdfIn PDF document text
    • https://s3.amazonaws.com/bezorito/ditavilanugagexo.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_off0000e4d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4D9 5116 bytes
SHA-256: 6459ffcd3fae5bb9daab70f85cd3e490846f872d7cd934322a433df41fbb924e
font_01_sfnt_off0000f642.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF642 11216 bytes
SHA-256: 8b8deb70646022a4d79bb7e9671e70999281b233587b9ffd96548f60cae63f4c

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