Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc1f3231ed281d19…

MALICIOUS

PDF

82.8 KB Created: 2021-03-16 05:35:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 5e9bb5e3f6a73f31136cb692e0ce98fc SHA-1: 2d69ba167cbaa6db03e875d29c95ea19a39d1214 SHA-256: dc1f3231ed281d196537533b80479f6190008df2a0c5d29812ae492980ca1138
186 Risk Score

Malware Insights

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

The 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 pointing to disposable hosting, suggesting it's part of a link farm designed to drive traffic or host malicious content. The primary URL, https://nipisod.ru/123?utm_term=expresiones+mas+comunes+en+ingles+pdf, is likely the intended destination for users tricked by the document's deceptive title.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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/123?utm_term=expresiones+mas+comunes+en+ingles+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4494888/normal_601b8ff758152.pdfIn PDF document text
    • https://vefibaxo.weebly.com/uploads/1/3/1/3/131379874/gafomipes-zifin-gigeworuz-vovebon.pdfIn PDF document text
    • https://gafepodaxo.weebly.com/uploads/1/3/4/6/134606739/niwebivos.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445125/normal_5fff6145abe5f.pdfIn PDF document text
    • https://cdn.sqhk.co/xojelumegasi/gWuhhge/amazon_prime_video_free_trial_canada.pdfIn PDF document text
    • https://kiwaluraxipexe.weebly.com/uploads/1/3/5/3/135326690/zomejanodedisu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451225/normal_5fc7c3d8199aa.pdfIn PDF document text
    • https://divupitibi.weebly.com/uploads/1/3/4/3/134328085/18c9549a80a29c.pdfIn PDF document text
    • https://cdn.sqhk.co/miwavilusaji/jjbIpsN/xapirutebotuvovujijuke.pdfIn PDF document text
    • https://ruliduwaj.weebly.com/uploads/1/3/4/0/134016670/potavugukopa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425235/normal_5ffe2517d6996.pdfIn PDF document text
    • https://jisetufazuv.weebly.com/uploads/1/3/5/3/135307323/sidagiv-sisukuzituxaxem-fanolelamofi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472494/normal_603454190c376.pdfIn PDF document text
    • https://cdn.sqhk.co/verexoleki/66ieWAq/grow_empire_rome_hack_game_download.pdfIn PDF document text
    • https://cdn.sqhk.co/lakarejof/bj7geid/semugomutu.pdfIn PDF document text
    • https://wosapinilesodiw.weebly.com/uploads/1/3/5/3/135347506/vakukikavamolaluma.pdfIn PDF document text
    • https://cdn.sqhk.co/bedazume/ohjWhbr/hello_dolly_movie_poster.pdfIn PDF document text
    • https://wepebajaka.weebly.com/uploads/1/3/4/5/134588919/subaxuxikepadori.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/c702e6f2-bbc0-464a-936f-6809c745f00d/transformers_revenge_of_the_fallen_2009_dual_audio_480p.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e06169c3-b596-4886-acea-3d01e26f62ab/bixewosowegopuvepe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8ace15c5-92be-4a15-be6b-f813f74171ea/don_juan_mexican_grill_bethlehem_pa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/32f20ae5-da67-485f-aff1-1858a3a7af80/52332057603.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4d9b58d6-ce8c-48d1-8e7d-7836e17e0548/how_to_use_your_phone_as_a_remote_for_vizio_tv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/acd1daef-581e-41e3-8813-529bba14b174/saxon_math_course_3_cumulative_test_16a_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/85715822-fc35-4936-bf61-0a3fa11d3523/wanilafabozufi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/be1bd7f7-afc3-474d-838e-e74aefcab6ab/27461041605.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c24ffa8-d425-4ec0-857f-4a496344692d/wijakuxepimalobibab.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_off0000f815.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF815 5500 bytes
SHA-256: 4dfadab02f9261a16182052e49dafdf232c98f341a5cbf6baa16bd7e06a0e836
font_01_sfnt_off00010ab2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AB2 1800 bytes
SHA-256: 51ebeec29509b87aa858d500e37ac8853184703d07d1f913ce36d8e1dc7764c0
font_02_sfnt_off00011340.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11340 12176 bytes
SHA-256: dfa877701827280d9329fc996f71946b9912c2528a446aaec5e2929ba5c68704