Malicious PDF — malware analysis report

Static analysis result for SHA-256 c35b65f3b321b715…

MALICIOUS

PDF

82.9 KB Created: 2021-03-14 02:30:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 7a10e2a978351904cf16b420aac0214a SHA-1: f227d0a8d0d92ef3142e66e68e97b7f09d9dddf4 SHA-256: c35b65f3b321b715fb51902541c48144502f94e3ffcd2442568623b99b657927
186 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to leverage external resources for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://pelibifir.ru/strik?utm_term=battery+for+casio+g+shock+5146 PDF link annotation
    • https://bogobesupagal.weebly.com/uploads/1/3/0/7/130775478/levaf.pdfIn PDF document text
    • https://nafogoke.weebly.com/uploads/1/3/4/7/134776139/nisavejopiwatigefelo.pdfIn PDF document text
    • https://maninidepot.weebly.com/uploads/1/3/4/7/134702581/e6a42bcd0.pdfIn PDF document text
    • https://cdn.sqhk.co/moxinivo/geBiAja/pawowutolix.pdfIn PDF document text
    • https://cdn.sqhk.co/kowumutajaw/hi6gdhi/3961605314.pdfIn PDF document text
    • https://cdn.sqhk.co/sowojusawepu/7ggwuih/play_funky_karts_online_for_free.pdfIn PDF document text
    • https://gitapizi.weebly.com/uploads/1/3/2/6/132683136/vukapu_xifabenivat_bekezawisi.pdfIn PDF document text
    • https://cdn.sqhk.co/tefozakozup/hbhaoic/vufuk.pdfIn PDF document text
    • https://nuzozixajalupik.weebly.com/uploads/1/3/0/7/130739607/mobiko_dolifuxat_rufate.pdfIn PDF document text
    • http://gagitevanonuti.mywebcommunity.org/traducir_de_espaol_a_latn_clsico.pdfIn PDF document text
    • https://ziloxewimufe.weebly.com/uploads/1/3/0/8/130813797/8093834.pdfIn PDF document text
    • http://midunetojonawiw.mywebcommunity.org/whirlpool_duet_washer_repair_manual.pdfIn PDF document text
    • http://bisibometixo.mywebcommunity.org/what_is_the_price_of_sub_zero_fridge.pdfIn PDF document text
    • https://gunobodupisar.weebly.com/uploads/1/3/4/6/134677737/6377538.pdfIn PDF document text
    • https://relogeseji.weebly.com/uploads/1/3/0/7/130739887/4bce04fa5298.pdfIn PDF document text
    • http://xabigaxen.22web.org/the_greatest_salesman_in_the_world_scrolls_audio.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/e7204f6f-80db-40ea-a42d-4c5a7332943e/25141864439.pdfIn PDF document text
    • http://vekujekodabudu.epizy.com/posawu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d6463dc8-644c-49fc-a10f-493c6eeb30d0/how_to_read_a_chapter_in_the_bible.pdfIn PDF document text
    • http://femejedad.epizy.com/identifying_hundreds_tens_and_ones_worksheets.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fd401775-55e3-4491-ba80-cc6fe6678945/nodikumusoxapozujuk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/05744a1a-fa39-41ad-875a-c43d33ae5638/major_issues_of_higher_education_in_pakistan.pdfIn PDF document text
    • http://xorinonaf.rf.gd/bivariate_binomial_distribution.pdfIn PDF document text
    • http://zoribele.epizy.com/50076271022.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_off00010261.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10261 5744 bytes
SHA-256: 89914705f4fb48682c2c81f921f920cffee7d1902d223d104231d611df5c9381
font_01_sfnt_off0001160b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1160B 11320 bytes
SHA-256: 449da15a89a59f220586677c9dc2e1706adf29788c9c5e7f5f9bebaa58392391