Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c163a51a7ae08b1…

MALICIOUS

PDF

88.9 KB Created: 2021-03-20 09:49:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: ab39e9fee060fe39322e2ef6feaf8b9b SHA-1: c59c9566c44b85fb2c4427292abbba0e3fb52902 SHA-256: 3c163a51a7ae08b1d2f20e564a00fa380ea2ce1ddfbe8c43135f4b13824f7a83
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious content. It contains a large number of external links, suggesting a link farm or SEO manipulation tactic. One of the primary URLs, https://jottigo.ru/123?utm_term=msc+biotechnology+resume+format, is likely used to direct users to a malicious site. The presence of embedded JavaScript, although not fully detailed, further supports the malicious intent.

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 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://jottigo.ru/123?utm_term=msc+biotechnology+resume+format PDF link annotation
    • http://nesorus.mywebcommunity.org/nebapoziz.pdfIn PDF document text
    • http://tinesemexogo.mygamesonline.org/56701408119.pdfIn PDF document text
    • http://fanilobepewe.sportsontheweb.net/types_of_bolted_joints.pdfIn PDF document text
    • https://cdn.sqhk.co/rojarimeg/hi9xwgc/85429429978.pdfIn PDF document text
    • http://penageli.getenjoyment.net/rojozijopadasewilelem.pdfIn PDF document text
    • http://xefawojuj.mygamesonline.org/30869788044.pdfIn PDF document text
    • http://alesyasemiletova.com/university_physics_serway_and_jewettqd2jr.pdfIn PDF document text
    • http://mapotilij.mygamesonline.org/saregir.pdfIn PDF document text
    • https://cdn.sqhk.co/ximegawaso/geONsie/13280573008.pdfIn PDF document text
    • http://gtomishebs.xyz/nature_essay_by_ralph_waldo_emersonlps8w.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gufopexolax.myartsonline.com/bible_quiz_genesis.pdfIn PDF document text
    • https://s3.amazonaws.com/didowugorokirug/john_deere_345_engine_problems.pdfIn PDF document text
    • https://s3.amazonaws.com/fezenur/free_online_meal_plan_template.pdfIn PDF document text
    • https://s3.amazonaws.com/nawosineromigi/brayton_cycle_problems_and_solutions.pdfIn PDF document text
    • https://973697ad-ffa4-4f9d-85cd-0c9d1ea039ee.filesusr.com/ugd/5f5755_387b4d7d7d794a859b7175559537408f.pdf?index=trueIn PDF document text
    • https://8c285b57-3156-47ce-881b-df665acc117b.filesusr.com/ugd/8d46c2_b81172cd47bc475fb0eba617bce3e5d1.pdf?index=trueIn PDF document text
    • https://22449060-8e30-4723-8828-967625cce342.filesusr.com/ugd/eddc50_44fc19f57cf9450da2e87e7c9e3601cb.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dobesogum/how_long_is_harry_potter_8_in_hours.pdfIn PDF document text
    • https://9b56c271-8e60-4ff0-96d1-8930f8c082f8.filesusr.com/ugd/5a1ab0_c72fae33f1354bd89d6598a43ff27584.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vatakefojunib/evil_dead_all_parts_dual_audio.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_off00011b0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B0B 5540 bytes
SHA-256: 7264ce4278201438ea30a4bc4cde7d630ee24a4f826a470d4bfe294c8729b973
font_01_sfnt_off00012dcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DCD 12156 bytes
SHA-256: 993493a2881e5519aae1321e7e808f588e893f898ab4c399302c6c175233b8dc

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