Malicious PDF — malware analysis report

Static analysis result for SHA-256 29660ce19604a354…

MALICIOUS

PDF

75.5 KB Created: 2021-03-27 10:33:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: d8be9504a60cbb4343a84565bb4ed41e SHA-1: 550a18574b5b2f7b9434194f7981124b4db54fc7 SHA-256: 29660ce19604a35476333092c338374afe406fbe26b28696fe53fedeedb82146
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://vilenefex.ru/123?utm_term=is+android+os+linux+based PDF link annotation
    • https://wilegefozuf.weebly.com/uploads/1/3/4/3/134399327/5911573.pdfIn PDF document text
    • https://cdn.sqhk.co/palazawu/ieMTifr/country_friends_cafe_muncy_valley_pa.pdfIn PDF document text
    • http://kovuzaxaf.medianewsonline.com/filulanowogap.pdfIn PDF document text
    • https://xizavuxovom.weebly.com/uploads/1/3/3/9/133986710/7b1a33.pdfIn PDF document text
    • https://cdn.sqhk.co/repipedifavi/9GXmIc0/pixaxa.pdfIn PDF document text
    • https://cdn.sqhk.co/sirazisiluz/Vvge0en/task_project_management_meistertask.pdfIn PDF document text
    • https://cdn.sqhk.co/boxewemutox/cAibRGd/beholder_definition_in_dictionary.pdfIn PDF document text
    • https://cdn.sqhk.co/zinumazak/jg19qge/parulexumu.pdfIn PDF document text
    • https://zovarufegurer.weebly.com/uploads/1/3/4/6/134625168/e870e57f6de2178.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://05efeaee-ea5b-4dc8-bddc-a5098cc0dcbd.filesusr.com/ugd/c06c30_4945c0c1231d48308c73b991d0149d5f.pdf?index=trueIn PDF document text
    • http://mixonanax.epizy.com/24402680655.pdfIn PDF document text
    • https://s3.amazonaws.com/nitirew/android_tv_box_4gb.pdfIn PDF document text
    • http://magegefopo.atwebpages.com/liwibudotimewof.pdfIn PDF document text
    • https://s3.amazonaws.com/bevarolimesale/jotubuxigebewowitudep.pdfIn PDF document text
    • http://zakuzoresibib.epizy.com/43868255437.pdfIn PDF document text
    • https://68a74d12-89ac-4a94-b826-09ad332a30bf.filesusr.com/ugd/1a0392_126943725aca406caf4f69f3d2b28b6d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dikobepibelun/dream_come_true_song_free.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA0C 4964 bytes
SHA-256: 21df50054cc9d04e49b5cac134cf7a8eeadcf38ed004137ff2acae2be8bf817f
font_01_sfnt_off0000fafd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAFD 10928 bytes
SHA-256: 0e280487bfa331f25e33622a393bf52dffd8c23580c4973a21a94cc6fcbc74ef

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