Malicious PDF — malware analysis report

Static analysis result for SHA-256 b31e93c14cff649e…

MALICIOUS

PDF

84.8 KB Created: 2021-06-07 05:59:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 363eb522032ec562ffca5504dfa80bd3 SHA-1: 3c07e9356055d9c34beef28c298fadb0d300eb3c SHA-256: b31e93c14cff649e0d20ac405bfa17c1cb63a4d9f85342b39a40f85f03014faa
186 Risk Score

Malware Insights

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

This PDF file exhibits characteristics of a link farm, containing numerous external links to various websites, including one with a UTM term suggesting a phishing lure. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the PDF structure and embedded URLs point towards a spearphishing attachment attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://druttle.ru/123?utm_term=formation+chaudronnier+afpa+lorient PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4401538/normal_602eb4a53a3ec.pdfIn PDF document text
    • https://kawokuxaletufe.weebly.com/uploads/1/3/4/3/134345859/xumoxixewirulev.pdfIn PDF document text
    • https://fedubipogumuwu.weebly.com/uploads/1/3/1/3/131379546/jazed_lejofafuk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4498994/normal_60370587c900f.pdfIn PDF document text
    • https://valodoxajub.weebly.com/uploads/1/3/4/4/134435871/48680c42b56d9.pdfIn PDF document text
    • https://pipenibeteza.weebly.com/uploads/1/3/4/5/134508730/pebizovonikozupijo.pdfIn PDF document text
    • https://wijowapozibam.weebly.com/uploads/1/3/5/3/135329999/2584875.pdfIn PDF document text
    • https://nunofisodopuw.weebly.com/uploads/1/3/4/2/134234763/toxomoxonutuxuda.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4493209/normal_60b739e33ab1e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403820/normal_604a9290bf02a.pdfIn PDF document text
    • https://xopezafetuwov.weebly.com/uploads/1/3/5/3/135314897/nokapalagidosumatuva.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/3acb521b-33b3-4c46-bea1-4aa990172ba2/what_is_motor_function_assessment.pdfIn PDF document text
    • http://xugilip.pbworks.com/f/simultaneous_equations_with_fractions_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/adb392b4-ed45-453a-bebd-4716009cba85/is_robin_hood_prince_of_thieves_on_amazon_prime.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d28335e4-d9f4-459e-95ef-9d943c6edf9a/metodologia_dela_investigacion_documental_libro.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a313c2e4-e38b-4487-b129-b373d5696d00/benizu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/52ccea94-646f-4b4f-8648-462abeff39c7/barney_stinson_bro_code_episode.pdfIn PDF document text
    • http://xibosini.pbworks.com/f/shirdi_wale_sai_baba_mp3_songs_free_download_in_hindi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dceda46b-32c7-4795-b952-aab7802e1b89/what_times_what_equals_2535.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0dcac180-b91d-4216-997e-614cd1e4820d/74660411871.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_off0000f784.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF784 5172 bytes
SHA-256: 467f3bc8ee09b05b2e21efb2334d170560f00716645412dae9951640f923b97f
font_01_sfnt_off000108f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108F0 11592 bytes
SHA-256: d98d191016646af5808801c70dec19a421907c56efc2f7a73366e47480be3849
font_02_sfnt_off00012ead.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EAD 16204 bytes
SHA-256: e93acd332f5893643511f4cefd38969ad5c744ad1b08842a788b6be7d277dd15