Malicious PDF — malware analysis report

Static analysis result for SHA-256 950a821caed999bc…

MALICIOUS

PDF

95.2 KB Created: 2021-06-14 02:59:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 047c37f2e3542d1d66c55fa446daff80 SHA-1: 1e70c8f5baa7abcbd88bfbf7e4a309c3bda9599d SHA-256: 950a821caed999bc4575e5d23d74b3a8cafabfbe1007f2e5e2ab89fe9bf918ad
246 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. It uses brand-impersonation credential phishing. 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 0.9997

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.
  • Brand-impersonation credential phishing lure critical SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: action link to abused redirector https://rubavuwo.weebly.com/uploads/1/3/4/4/134403239/saxilawanuxikebokup.pdf.
  • 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://cructi.ru/pbw?utm_term=handling+customer+complaints+worksheet PDF link annotation
    • https://rubavuwo.weebly.com/uploads/1/3/4/4/134403239/saxilawanuxikebokup.pdfIn PDF document text
    • https://derajuxojop.weebly.com/uploads/1/3/1/4/131452827/5604a.pdfIn PDF document text
    • https://nutakiderovex.weebly.com/uploads/1/3/4/6/134622867/kokuvuzizavoletet.pdfIn PDF document text
    • https://sutenemumam.weebly.com/uploads/1/3/5/3/135323571/2189401.pdfIn PDF document text
    • https://lilikisewusufod.weebly.com/uploads/1/3/2/6/132682662/3701634.pdfIn PDF document text
    • https://jadibezunapav.weebly.com/uploads/1/3/4/6/134610372/eb621e7724.pdfIn PDF document text
    • https://gugukufetufa.weebly.com/uploads/1/3/4/3/134337187/getamewixakufuxaku.pdfIn PDF document text
    • https://zomurudol.weebly.com/uploads/1/3/4/4/134492975/1496949.pdfIn PDF document text
    • https://pimedoxeniku.weebly.com/uploads/1/3/4/6/134640330/gurumiresula.pdfIn PDF document text
    • https://bixanizutojez.weebly.com/uploads/1/3/4/4/134490846/5102267.pdfIn PDF document text
    • https://mopobaseburole.weebly.com/uploads/1/3/4/8/134859053/wifazazutosuze-popizifevener-kofaputudibo-mivuf.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/d98c991c-2a85-4acf-9d07-ae94574b7145/bloody_roar_2_juego_descargar_gratis.pdfIn PDF document text
    • http://gozuwef.pbworks.com/w/file/fetch/144522900/bloody_roar_2_portable_download_for_android.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cdd34024-7a9f-45d7-a71d-cb6603d34832/96839143042.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/df1df068-aa92-400a-96f0-b6c38ee8ab10/13067151127.pdfIn PDF document text
    • http://sepasakeg.pbworks.com/w/file/fetch/145243707/45481481637.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/097fd328-b5a6-42be-956c-b23bbf2a17da/how_much_should_i_invest_in_shares_as_a_beginner.pdfIn PDF document text
    • http://gutupum.pbworks.com/f/676800013.pdfIn PDF document text
    • http://sipibujewadu.pbworks.com/f/85750579822.pdfIn PDF document text
    • http://xalomuzavege.pbworks.com/w/file/fetch/144674184/sample_emergency_motion_to_stay_writ_of_possession_florida_foreclosure_judgement.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001395c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1395C 5604 bytes
SHA-256: fc7c250e25ad7429f73f9acd889d84e01960d0e904ca20c3c3276cdd433bb8ce
font_01_sfnt_off00014c4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C4C 10216 bytes
SHA-256: e76973965a5e026a3d9580043cb046640a17efac6d569be9bc0b069423d6998a