Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b124ec56b116cd6…

MALICIOUS

PDF

80.1 KB Created: 2021-03-25 04:37:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 896e84b5424ed72c2297d248a81e0516 SHA-1: b23fc115557442094051c644e41de00539f5beed SHA-256: 6b124ec56b116cd6473c3a19dfb3d6dbaba6441fc8a6a3da849b19672cb23ee8
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to potentially malicious content. The heuristic 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' indicate this behavior. The presence of an embedded URL and the ML classifier's high confidence score further support the malicious classification. No scripts were extracted, but the document's structure and link farm behavior point towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://ponafet.ru/wix?keyword=mp3+player+pro+apk+download PDF link annotation
    • https://xowimigijik.weebly.com/uploads/1/3/1/6/131637135/duninusoke.pdfIn PDF document text
    • https://cdn.sqhk.co/vovoritufi/uhiUPij/natigijoledosabaledon.pdfIn PDF document text
    • http://gesojepaxo.22web.org/48549553959.pdfIn PDF document text
    • http://xilenemivagola.mywebcommunity.org/gozanipas.pdfIn PDF document text
    • http://ruvogodozipabiv.scienceontheweb.net/cat_s_eye_margaret_atwood_free.pdfIn PDF document text
    • https://bekariniwoxisit.weebly.com/uploads/1/3/2/7/132710774/6eeed21b97743b.pdfIn PDF document text
    • https://ketumumev.weebly.com/uploads/1/3/5/3/135348104/ninif.pdfIn PDF document text
    • http://veselutut.mywebcommunity.org/95293383151.pdfIn PDF document text
    • https://cdn.sqhk.co/xomakonezema/hjG3Lid/78242414720.pdfIn PDF document text
    • https://litorizifugo.weebly.com/uploads/1/3/4/0/134042617/fotofegafafafo_kuvavoxanoge_dodojot_bupenina.pdfIn PDF document text
    • https://cdn.sqhk.co/tivinarafuvu/hbvhejh/business_development_manager_definition_english.pdfIn PDF document text
    • https://digonowokeke.weebly.com/uploads/1/3/1/8/131856318/zatezeborexule_legevujaxavuw.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://xazopufegi.onlinewebshop.net/occupational_health_and_safety_management_a_practical_approach.pdfIn PDF document text
    • http://jugoribomepi.rf.gd/early_humans_pictures_information.pdfIn PDF document text
    • http://gebawapevala.epizy.com/fikopakibijag.pdfIn PDF document text
    • https://9df6e0af-a028-4e88-91ba-61a1b37318d5.filesusr.com/ugd/7c1f05_790298ec7cfe4e9ab2e70eeeca9012e3.pdf?index=trueIn PDF document text
    • https://0ac950e2-707a-4e47-8bf4-daface0ea9db.filesusr.com/ugd/356f11_9afa20cdc63c46b991793559e967eb2a.pdf?index=trueIn PDF document text
    • https://c83cbd6e-a134-4b49-ba12-49f24c654ad9.filesusr.com/ugd/904a8b_565de2f7f0a54595992ae159eea64ae1.pdf?index=trueIn PDF document text
    • http://kavibajegis.onlinewebshop.net/el_nombre_de_la_rosa_castellano.pdfIn PDF document text
    • https://afa032df-bfad-47da-a9c8-c79260182993.filesusr.com/ugd/6f9b04_8f21def174e142f595ee6166027be131.pdf?index=trueIn PDF document text
    • http://duxejuxaxeze.epizy.com/sixajazebosoxujusumuzesun.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000efe0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFE0 4860 bytes
SHA-256: bc47b2a8456dcc60817908e20734a42a506a999b5ae2fae137d6fdbea8216203
font_01_sfnt_off00010086.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10086 11364 bytes
SHA-256: 777c5b0edb020e92f1ecc392cc681b7f17993d988d8e1870a9665dc8bda1a942
font_02_sfnt_off00012554.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12554 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71