Malicious PDF — malware analysis report

Static analysis result for SHA-256 51b8960cca4843a0…

MALICIOUS

PDF

79.4 KB Created: 2021-03-22 10:33:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: c76f2d5dab113562b0cea0d22ccd2b37 SHA-1: bc07fd863be3d22a4d3cd0db778b1abf92672b03 SHA-256: 51b8960cca4843a0f5d664614e02b6e32ef492c795fd8514d22aa7badba6da9f
186 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, many pointing to disposable domains, indicating a link farm or redirection scheme. The presence of a ClamAV detection for 'Pdf.Phishing.Trojan' and ML classifier flagging further supports malicious intent. The document body, though truncated, suggests a lure related to filling out a power of attorney form, likely to trick users into clicking the embedded malicious links.

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://golowaki.ru/strik?utm_term=como+llenar+un+formato+de+carta+poder+en+mexico PDF link annotation
    • http://1ux.site/50639014326em68f.pdfIn PDF document text
    • https://balixilime.weebly.com/uploads/1/3/1/3/131398392/568f3d.pdfIn PDF document text
    • http://pojekofa.iblogger.org/76300584801.pdfIn PDF document text
    • http://lessonsonline.site/mifepitadazirixisurod5hcbl.pdfIn PDF document text
    • https://nutifikidejuz.weebly.com/uploads/1/3/4/3/134347692/bozozuxewogipumexuzu.pdfIn PDF document text
    • http://ukrdomonis.xyz/problem_solving_with_c_10th_edition_redditggw9c.pdfIn PDF document text
    • https://cdn.sqhk.co/solalokazili/aifL9kH/70944606568.pdfIn PDF document text
    • https://cdn.sqhk.co/woleparos/iOuhjdh/oreo_icon_pack_apk_download.pdfIn PDF document text
    • https://toxovapuwelubu.weebly.com/uploads/1/3/4/7/134733969/jezikebari.pdfIn PDF document text
    • http://arenda-comp.space/att_uverse_dvr_no_info_availablemiad4.pdfIn PDF document text
    • http://avto-trokot.xyz/240606760931w18.pdfIn PDF document text
    • https://fufukarebalomok.weebly.com/uploads/1/3/4/3/134352968/jobokodifum.pdfIn PDF document text
    • https://cdn.sqhk.co/xugiwatokax/hisjeib/formacion_de_boca_vs_river_2019_libertadores.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://solilajikabode.rf.gd/ar_condicionado_portatil_philco_ph11000f_manual.pdfIn PDF document text
    • https://cee4a208-09ac-40e0-983f-4c2cc776acbe.filesusr.com/ugd/5ed537_88d7f232d4854f2cb5b75be517f0608c.pdf?index=trueIn PDF document text
    • https://68e1e3d4-268d-49bc-a8aa-b119cb10fea7.filesusr.com/ugd/3ceeb9_e74f8b4cd161478e83aa354852dc2cc4.pdf?index=trueIn PDF document text
    • https://e3e1c2aa-7f41-47b0-8c2f-d823cb48b857.filesusr.com/ugd/7598fa_04ab15c02c344f33a2b2ed47a0c244a3.pdf?index=trueIn PDF document text
    • https://05b56818-8b0b-4484-a411-4f1234233f1c.filesusr.com/ugd/e49726_2815a58ba68a4f5faa6c7f9e05843ef7.pdf?index=trueIn PDF document text
    • http://tubusivi.rf.gd/benzenoid_and_non_benzenoid_compounds.pdfIn PDF document text
    • http://bibesatu.epizy.com/nogisavufasunumilu.pdfIn PDF document text
    • http://vudamup.rf.gd/kindergarten_cop_2_imdb_parents_guide.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_off0000edd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDD3 5096 bytes
SHA-256: 5b1fcf701bd8eae92f5730b5e8c5c5ead169c50d0391b748a3291d87fc585ebb
font_01_sfnt_off0000ff0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF0C 1636 bytes
SHA-256: bfba50ad4feeef2c19d4e06de581bdd1d0139814ede4844fc3850d755643d398
font_02_sfnt_off00010745.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10745 11816 bytes
SHA-256: 7e60df0556159fd1627008cc0fcab15b95b2094a68f33194f4cc7ccaca545649