Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9a81a6083fbc89f…

MALICIOUS

PDF

118.0 KB Created: 2021-05-20 21:20:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 0176c9ddfd365ef2231b8dbdf9608f68 SHA-1: 9357bc27fa14c7111122175066ba2190c709482c SHA-256: c9a81a6083fbc89f9315bab9f37b43061d928f6376eec72937a0c5fb89e66c84
186 Risk Score

Malware Insights

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

This PDF document was identified as malicious by multiple heuristics and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous external URIs, with a primary suspicious URL being https://resalured.ru/strik?utm_term=administracion+por+valores+ken+blanchard+pdf. The document's structure and the presence of many links suggest it is designed to redirect users to potentially harmful websites, possibly for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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.
  • 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://resalured.ru/strik?utm_term=administracion+por+valores+ken+blanchard+pdf PDF link annotation
    • https://nufapapezo.weebly.com/uploads/1/3/0/9/130969462/4b97a9.pdfIn PDF document text
    • https://jagunafine.weebly.com/uploads/1/3/4/3/134363358/8201412.pdfIn PDF document text
    • https://wirevoge.weebly.com/uploads/1/3/1/8/131856771/sigujibive_zibilabapi_fumefulakiserel.pdfIn PDF document text
    • https://wavenugila.weebly.com/uploads/1/3/4/8/134852162/1586774.pdfIn PDF document text
    • https://gesalosozim.weebly.com/uploads/1/3/7/5/137504479/tokutuvokolus-zaveviseva.pdfIn PDF document text
    • https://vademakab.weebly.com/uploads/1/3/1/3/131380849/lobodulusabopi_bofejutopaw.pdfIn PDF document text
    • https://vabeluzaxudi.weebly.com/uploads/1/3/4/8/134884936/tisawusipopudot.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/feborobegibew/how_to_smoke_a_rump_roast_in_a_smoker.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a3c8b8be-5aad-4bad-88c6-ef7803ccdfeb/posufuvumitora.pdfIn PDF document text
    • https://s3.amazonaws.com/solonebosop/what_should_you_look_for_when_buying_a_second_hand_car.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a7432c61-454c-407e-bc2e-f64f0dc4945d/19889870097.pdfIn PDF document text
    • https://s3.amazonaws.com/vifusupegiza/what_is_the_average_salary_of_a_medical_technologist.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d515048e-e243-4d1b-9ee2-dc722930a2d5/how_to_reset_ingenico_lane_3000.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/88b0cba7-62b0-4770-9dd8-be3b29a56aa3/julius_evola_metaphysics_of_war.pdfIn PDF document text
    • https://s3.amazonaws.com/xoferuzu/masters_degree_in_management_information_systems_in_canada.pdfIn PDF document text
    • https://s3.amazonaws.com/vajefam/57639679347.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c75ac750-5f1d-4473-be05-2f68ff409272/38014957359.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/88de320e-7fe1-4f34-877a-a62bfe00ea95/which_app_is_best_for_learning_korean.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/15fe1e5c-1d97-4a7f-9f63-eb9a66a261e9/how_to_remove_ice_maker_from_kenmore_fridge.pdfIn PDF document text
    • https://s3.amazonaws.com/kudufigunabi/dbt_emotional_regulation_skills_list.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f867670c-783a-44c6-88cc-d37603a5eda0/how_to_tell_if_element_is_paramagnetic_or_diamagnetic.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1613d9df-07e6-42df-a355-a2e562edabd0/xixidezufukoti.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_off00018e6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18E6E 5648 bytes
SHA-256: 8b1e16789ae2fea18b22090416ee9d7b1b63f21bc1ecc0ba41f7d28116ef1d9d
font_01_sfnt_off0001a17c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A17C 12604 bytes
SHA-256: dbcf8c22a0f46105954d5fdd93ecd3b06b6be19e6a62bf0a4409e742027ab0b6