Malicious PDF — malware analysis report

Static analysis result for SHA-256 eae696b6a7ae36fb…

MALICIOUS

PDF

95.7 KB Created: 2021-03-10 05:10:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 46a2555be49e71575e72d170321f7f89 SHA-1: d746ddce7ccca245cf8ae6edfad0556b0cc3d7c0 SHA-256: eae696b6a7ae36fb5c285297c10ffdb5c820b51e060a52c07543619d67f4c6f5
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 to redirect users to phishing or malware-hosting sites. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a malicious document designed to exploit users through external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 6

  • 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.
  • 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://botokaw.ru/123?utm_term=advanced+filter+excel+to+another+sheet
    • https://pefojefevofat.weebly.com/uploads/1/3/4/6/134659321/vomegorakovuparumusi.pdf
    • https://cdn.sqhk.co/jukelifawap/hfmfVFP/how_to_draw_rappers_hip_hop_cartoons.pdf
    • https://felezawobo.weebly.com/uploads/1/3/4/8/134896203/8078325.pdf
    • https://cdn.sqhk.co/retesixabe/Oic6Ugh/86860817208.pdf
    • http://lenilakuwesesef.iblogger.org/what_does_step_2_mean_in_aa.pdf
    • https://fukagopesuzidad.weebly.com/uploads/1/3/1/3/131381553/7839593.pdf
    • https://cdn.sqhk.co/sadudolamom/h50Afbp/zoom_cloud_meetings_apk_for_ios.pdf
    • http://sunesasewi.iblogger.org/baixar_livro_namorado_de_aluguel.pdf
    • https://kutoponipikule.weebly.com/uploads/1/3/4/8/134849894/navawujogafuwe-zilami.pdf
    • https://cdn.sqhk.co/gufojakig/gg3b5bw/pifebegum.pdf
    • https://wotuvinuvokotar.weebly.com/uploads/1/3/5/3/135330473/2b5255fa5d.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://vowonedof.epizy.com/wajemufazanukogatunefo.pdf
    • https://21a67f6d-2aea-439f-a910-ed4feb6be009.filesusr.com/ugd/173616_55ec5c1ac4f746c0807ac612ae1d5209.pdf?index=true
    • https://777dd155-384c-4f1d-a337-8f27b94bb056.filesusr.com/ugd/1ecdae_4449cf25d6264bdd83aac6edf3d3f415.pdf?index=true
    • https://d8ec88ce-93b1-4b83-b294-7016fd5b5063.filesusr.com/ugd/366252_ed035acee7204305b0cf95ebd4b97673.pdf?index=true
    • https://s3.amazonaws.com/varolexexus/chest_guidelines_pulmonary_embolism_diagnosis.pdf
    • https://be0a50f7-7e29-4ea0-9fdb-4392a44f0e3c.filesusr.com/ugd/1decf9_ef3ecdb20d0242f098409bf9ce162f5f.pdf?index=true
    • http://vajexakatozezal.epizy.com/investor_s_guide_to_thriving.pdf
    • https://7404da97-7fcf-4d5f-9d5f-3f8644e6773a.filesusr.com/ugd/35f767_7b8140f8d5bc4b31a6ec21c746dc6b2a.pdf?index=true
    • http://kikegapel.epizy.com/16856592023.pdf
    • https://s3.amazonaws.com/kikunojulejuj/61847099445.pdf
    • https://s3.amazonaws.com/bomifabipi/64287782739.pdf
    • https://8488b7ac-84bc-45ae-88ed-26841205fc59.filesusr.com/ugd/7cda3c_d4d95b2697484c7691952cff86cbd65a.pdf?index=true
    • https://57933e30-1e86-4cbe-ad2b-777cb72f9932.filesusr.com/ugd/235f1a_94528f1a585a425a8d1791925b51df02.pdf?index=true
    • https://dd907c4b-492b-4b4d-bf3c-9f0b7a2bd2c7.filesusr.com/ugd/96a426_672f4d90a67340c2adafef5ba18721a3.pdf?index=true
    • https://9849c7ec-8b19-4b81-9a64-db2537ea7c40.filesusr.com/ugd/97b1c0_bc57ddf235734de1aa6db2b6e62b28db.pdf?index=true
    • https://ced6af22-cf5f-4df0-9cd6-2d424634d287.filesusr.com/ugd/3eed2b_52bd197b8c2c441b81c46b7d4696e6bb.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00014ae8.bin
03efc84689b0e3004af9021f14cbe6691b944195a879262723eb4f725fee7819
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x14AE8 22348 bytes
font_00_sfnt_off00011279.bin
ca2bf7704cfd7a54e3ac08046e13cad9079268601e4763dae12108c5f16e0afc
pdf-font-stream PDF embedded font (sfnt) at offset 0x11279 5228 bytes
font_01_sfnt_off00012449.bin
a82909aa48fd5cc09620e92246fe4a7f0d062b90fa6b489046c00dd9b87c8973
pdf-font-stream PDF embedded font (sfnt) at offset 0x12449 11240 bytes