Malicious PDF — malware analysis report

Static analysis result for SHA-256 4df1b74215043032…

MALICIOUS

PDF

83.1 KB Created: 2021-03-16 13:44:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: ac6da693f1951cb7817905b4677516b3 SHA-1: eec5d7d2c458903039dc6b2b203003a510c95e7d SHA-256: 4df1b7421504303283220d7ba29c1477bd20348121105a35af6f9918e30429ab
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The document body, though heavily obfuscated, contains keywords related to software downloads, further supporting the lure. The presence of embedded URLs and the PDF structure point towards techniques used to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://nipisod.ru/wix?keyword=dolby+atmos+apk+xiaomi+no+root PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4447433/normal_601724815a9c9.pdfIn PDF document text
    • https://jigebizelu.weebly.com/uploads/1/3/1/4/131438259/ac6959f.pdfIn PDF document text
    • https://baluwakenina.weebly.com/uploads/1/3/1/4/131437578/delowab_seratovopur.pdfIn PDF document text
    • https://jomokojexenubi.weebly.com/uploads/1/3/4/8/134877089/danopi_logatevamimogif_tibotiwaremolak.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495841/normal_601742922697d.pdfIn PDF document text
    • https://wawodupalise.weebly.com/uploads/1/3/4/6/134621762/25be886c8a.pdfIn PDF document text
    • http://damvglaz0.xyz/ceneval_medicina_guia3fsf9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458837/normal_5fda552688f31.pdfIn PDF document text
    • http://cozyplacefor.rest/lufonilixmwxb1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403816/normal_603f9af9aeb58.pdfIn PDF document text
    • http://adanakebap.org/focusrite_scarlett_18i20_3rd_gen_drivert61qs.pdfIn PDF document text
    • http://priz24.site/34459137032zfn5i.pdfIn PDF document text
    • http://bunnygummy.ru/finumewuvubinigitovigidyjd7t.pdfIn PDF document text
    • http://boost-shop.xyz/genekizutidejeuvfs.pdfIn PDF document text
    • http://parralax.net/3242661404767c48.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379848/normal_603950de21a5c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://44f68060-d5e3-4d58-b4e7-e3760392f352.filesusr.com/ugd/49488e_1bcde65beca34ab680ab36503f61bb9a.pdf?index=trueIn PDF document text
    • https://ef4b221f-cfb4-47e8-bf1d-3b5092770df7.filesusr.com/ugd/4948da_3c745fa3f0044ebeb44cb967261131bb.pdf?index=trueIn PDF document text
    • https://835a0401-7144-467e-aacc-710587930ffc.filesusr.com/ugd/432cba_cd2094ff898f4a79904f2db2f393aba7.pdf?index=trueIn PDF document text
    • https://9d349da1-218b-4b59-9e37-2a90cab56d40.filesusr.com/ugd/de9003_5c6eed343b1e493ab9d1c8aeba784c51.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/09a2f96a-57c6-448d-a998-e8184771effb/how_to_migrate_exchange_2007_to_office_365.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/678e2a08-14bb-4ec2-894b-2da17c8cf0f3/tabla_de_densidad_y_peso_especifico_de_solidos_liquidos_y_gases.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_off000106ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106EF 5340 bytes
SHA-256: 1bb46b0f72d7936a40b5ccaacb5cc5b27ee7d1565bd0e9fcb9e52fc0f3bd138d
font_01_sfnt_off00011908.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11908 11068 bytes
SHA-256: 27268b45351f5f823ee102a166c7f146c3df0b09c59b516523e4df7440572328