Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b8d9a3f8044a464…

MALICIOUS

PDF

81.6 KB Created: 2021-03-16 15:43:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: c60e646d262838e6c78848695c385127 SHA-1: 7ecbeabba3c27f6058f499b4f244587471faf214 SHA-256: 9b8d9a3f8044a4645aeeae3e88cb08f387ff08553f17c62050a5841d52979176
226 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious sites. The 'SE_PAYMENT_REDIRECT_LURE' heuristic indicates the document's content is designed to trick users into believing there are new or changed payment instructions, a common tactic in business email compromise attacks. The ML classifier and ClamAV detection further support the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 7

  • 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.
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise 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://nipisod.ru/wix?keyword=root+rashr+-+flash+tool+apk+free+download PDF link annotation
    • https://gafokogem.weebly.com/uploads/1/3/0/8/130874161/zezukixunax.pdfIn PDF document text
    • https://bolumuratojepo.weebly.com/uploads/1/3/4/7/134749128/pututewaw_sovigu_firomasugu_tebepufixefu.pdfIn PDF document text
    • http://xulubapatoso.scienceontheweb.net/quote_from_the_little_prince_about_stars.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404285/normal_6010478dcdfc2.pdfIn PDF document text
    • https://sinekaku.weebly.com/uploads/1/3/5/9/135964305/3908946.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484169/normal_5fd60345aa9e3.pdfIn PDF document text
    • https://ginuwawabesinu.weebly.com/uploads/1/3/1/1/131164414/vozitisoj.pdfIn PDF document text
    • http://pafowitowa.medianewsonline.com/rumuxitewozakarokoxabi.pdfIn PDF document text
    • https://wanalepawipetep.weebly.com/uploads/1/3/1/8/131857983/zudamodogir_tesanixulu_nupitor.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367916/normal_5fd1c948756f5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368962/normal_6002dee8c6121.pdfIn PDF document text
    • https://pidexijot.weebly.com/uploads/1/3/5/3/135316959/wetiziloto.pdfIn PDF document text
    • https://jefanumu.weebly.com/uploads/1/3/4/8/134889008/xakirigena.pdfIn PDF document text
    • http://gelupulofevabek.medianewsonline.com/84817817255.pdfIn PDF document text
    • https://zerakekume.weebly.com/uploads/1/3/0/7/130739742/c5d68.pdfIn PDF document text
    • https://gafapelisepofas.weebly.com/uploads/1/3/4/7/134762307/mawikuwu.pdfIn PDF document text
    • http://pepujolajerikur.66ghz.com/ashfield_primary_school_uniform.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/7fbccf48-b8c2-4bdf-b4ef-0d3a3725540c/how_much_does_100_military_disability_pay.pdfIn PDF document text
    • http://zanawolusebil.epizy.com/bossy_verbs_worksheet_year_3.pdfIn PDF document text
    • http://wasamatebupo.rf.gd/how_to_connect_samsung_m2825dw_to_wifi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/947bd473-f15d-4c42-bfcd-0d1775544acc/newixoxaxosorugenuno.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB70 5324 bytes
SHA-256: b0f95858516d11f5903d6d289c42132242113f5e88653b34cda12cae4389b842
font_01_sfnt_off0000fda1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDA1 11052 bytes
SHA-256: 84b0aed21cf03a671b1bb516257a28f8e0552992af665bcad4934a8a54621aad
font_02_sfnt_off000123c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123C2 16092 bytes
SHA-256: e9fe716c2abc985b12a899a49d5539e4e8be1b56d50c083b30290d85a2a7c848