Malicious PDF — malware analysis report

Static analysis result for SHA-256 5590854b6b76a1e0…

MALICIOUS

PDF

78.5 KB Created: 2021-05-13 03:20:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: df1a6e8835413b67bc7b144fbcc5af15 SHA-1: b40b12438121d8d05f84410a12d3ca54565bdbbe SHA-256: 5590854b6b76a1e0ad9f4c62cf24f142f78ac58a982fbfe38a0f007a166d7609
244 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many pointing to disposable hosting and redirector infrastructure, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the presence of numerous external links and the PDF structure itself are indicative of a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/strik?utm_term=dreamweaver+php+mysql+tutorial+pdf In PDF document text
    • https://cdn.sqhk.co/molavagew/1wl6gid/sajotokanodalu.pdfIn PDF document text
    • https://cdn.sqhk.co/gebitasixa/eiagjT7/filariasis_disease.pdfIn PDF document text
    • https://cdn.sqhk.co/numokafas/GUbigjh/where_s_my_water_3_game_online.pdfIn PDF document text
    • https://lipemegovaw.weebly.com/uploads/1/3/4/7/134766771/fulijitabipe_komefafolox_melemixaxep.pdfIn PDF document text
    • https://wariraxaluxar.weebly.com/uploads/1/3/3/9/133986847/9249992.pdfIn PDF document text
    • https://zakikubefetopu.weebly.com/uploads/1/3/2/6/132696201/3259871.pdfIn PDF document text
    • https://fotejisatowonu.weebly.com/uploads/1/3/2/3/132302873/dodigow.pdfIn PDF document text
    • https://mafupalitofix.weebly.com/uploads/1/3/4/0/134042392/nifiso.pdfIn PDF document text
    • https://midatapeb.weebly.com/uploads/1/3/1/0/131070166/xederasa.pdfIn PDF document text
    • https://palejuzuz.weebly.com/uploads/1/3/5/9/135959315/c955d650bc446ff.pdfIn PDF document text
    • https://cdn.sqhk.co/tezofugowura/nz9KhdA/japonaruduw.pdfIn PDF document text
    • https://fuzedefona.weebly.com/uploads/1/3/4/5/134578490/e3403da4a7d.pdfIn PDF document text
    • https://cdn.sqhk.co/manigonodapu/cjeWRjb/71583358982.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/xeroguru/talepexavofejasiwosasi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d8db031-35a0-458c-b9bb-0002600c9c5a/what_skills_do_you_need_to_be_a_public_relations_specialist.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d04715c1-3937-4c6e-a767-9a46a7866b4b/simpson_pressure_washer_3000_psi_2.4_gpm.pdfIn PDF document text
    • https://s3.amazonaws.com/werowibovezoje/mimefo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ce1b6de-d046-4199-9f1a-48ab1372ca84/spring_mvc_hibernate_tutorial_for_beginners.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2cd6b42e-cbec-47c8-a31b-f8a169b34ef2/vunuserujisala.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/54470762-67a9-4a5d-9fac-048b0b7b6718/analisis_de_los_personajes_de_100_aos_de_soledad.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a9d39351-dae4-4408-a9e0-9b9306ec0fbe/can_i_terminate_my_house_rental_agreement_early.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b8917839-c994-4184-955e-faac2add711f/pokemon_sun_and_moon_series_episode_5_in_hindi.pdfIn PDF document text
    • https://s3.amazonaws.com/xisefowu/xivutexolufe.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_off0000f243.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF243 5660 bytes
SHA-256: 2c87bb998e5de52f48503decfb5a4f3733f48bab5f6974d38301bbba1fd2eb5d
font_01_sfnt_off0001057d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1057D 11616 bytes
SHA-256: 1053ff74b1fa7f80aabcd43ec2018e73b085554172937a64afbd0809ec614324