Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4e2f2daf60ddb67…

MALICIOUS

PDF

81.3 KB Created: 2021-03-25 03:16:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 16972f7e2209596945050762d208aab0 SHA-1: 0e48940ffb5fbf7cdc614ab3c90c8e1afbbc2e57 SHA-256: b4e2f2daf60ddb67a680a3c437af264592324e1cffa3dec605c14e2e39c989d8
186 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO spam operation. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external links point towards an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://xajibur.ru/award?keyword=el+almohadon+de+plumas+pdf+cuento PDF link annotation
    • http://rerulekoba.66ghz.com/13277046140.pdfIn PDF document text
    • https://cdn.sqhk.co/mubafazus/SQZsAP5/12649957505.pdfIn PDF document text
    • https://pakefipeve.weebly.com/uploads/1/3/4/0/134017053/vusozunuwolig_vitore_xutete_gisozukil.pdfIn PDF document text
    • https://nodirodenesubob.weebly.com/uploads/1/3/5/9/135986245/kumaviwisaza.pdfIn PDF document text
    • http://gezilobogobig.22web.org/6740968827.pdfIn PDF document text
    • https://kobokudebixisog.weebly.com/uploads/1/3/5/3/135390699/tideb.pdfIn PDF document text
    • https://cdn.sqhk.co/wobuwozavenu/Ehhmic9/smashing_pumpkins_mellon_collie_art.pdfIn PDF document text
    • http://dobazaviwamip.iblogger.org/3227575242.pdfIn PDF document text
    • https://cdn.sqhk.co/pabelewexo/niephfk/crazy_zombie_9._0_unlocked_snokido.pdfIn PDF document text
    • https://nekamefirojes.weebly.com/uploads/1/3/0/7/130739169/wixidu_joker.pdfIn PDF document text
    • http://www.valvanera.com/hquiroga.htmIn PDF document text
    • http://us.uruguaytotal.com/03_cultura/horacio_quiroga.htmIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://parubowigul.epizy.com/65434451913.pdfIn PDF document text
    • https://1afae0f6-9e35-4dc9-9db7-5dbf78511926.filesusr.com/ugd/afe78f_e5f6c2c705594e64a481cce1ff3fc2a3.pdf?index=trueIn PDF document text
    • http://rupilozomu.epizy.com/laporan_pendahuluan_fistula_ani.pdfIn PDF document text
    • https://5e6d3f51-9b35-4a29-baf4-1f036254a461.filesusr.com/ugd/99a8f2_2144d5800b4148af9e5f95750e603c37.pdf?index=trueIn PDF document text
    • http://gigufapaw.epizy.com/barberton_makhonjwa_mountains_attractions_and_activities.pdfIn PDF document text
    • https://0ccb9a81-bd3c-41bd-bc79-2352350f0e5e.filesusr.com/ugd/95ea6b_dba5bd9badef46788cb378d600f008c7.pdf?index=trueIn PDF document text
    • https://d62ff7d9-aefc-4ab8-8cdf-af38868aea16.filesusr.com/ugd/54b9a1_492dd2b912fc4eb5a831ae16b7b708dc.pdf?index=trueIn PDF document text
    • https://973697ad-ffa4-4f9d-85cd-0c9d1ea039ee.filesusr.com/ugd/5f5755_cac9f74b144a42a8934cfa9372615d75.pdf?index=trueIn PDF document text
    • https://03dfb0eb-7fe6-4188-ad87-ea2b88df7b19.filesusr.com/ugd/f967ac_ba3476734f7a48c6be7dc4510cff6037.pdf?index=trueIn PDF document text
    • http://buvazow.epizy.com/wisir.pdfIn PDF document text
    • http://jidabalelibixu.rf.gd/toxuzefokuxas.pdfIn PDF document text
    • https://1a6c606f-1efd-495f-9370-57f425d809fd.filesusr.com/ugd/1be480_57fb682263e344e99ce074b3917e5405.pdf?index=trueIn PDF document text
    • http://taguramol.rf.gd/nevidojolumexomitopo.pdfIn PDF document text
    • https://ed36ca5d-e6e9-4caf-8bbb-3a8af5cfee16.filesusr.com/ugd/971556_7d8a897d886a4b358ea119fd9f4f1d6f.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_off000100e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100E7 5256 bytes
SHA-256: 42cf13171fa744ad0d34ed745abc9f5b8ad552ca3e1f6fa05a22a83399973928
font_01_sfnt_off000112a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112A6 11428 bytes
SHA-256: f66438101c7a75d6a855ff8c096395ee926ccfab2200fed66becc93264c08780

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