Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca5566f6d4393e50…

MALICIOUS

PDF

78.8 KB Created: 2021-03-31 05:20:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 93fcd8117d28114258d9ba254604ee99 SHA-1: b108540f3ac7985011c3dda980f09a09e787e330 SHA-256: ca5566f6d4393e505a6089e234cb1626c7dbd256f9b5261876ba3bddf7b4faa8
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains, indicating a link farm designed to drive traffic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://pelibifir.ru/wix?keyword=paper+mario+color+splash+strategy+guide PDF link annotation
    • http://idealica-itufficiale.website/barbie_dreamhouse_adventures_dolls_amazonl4y1c.pdfIn PDF document text
    • https://cdn.sqhk.co/pasededi/iejjgjF/dazalagusozejinopurozudi.pdfIn PDF document text
    • http://bamefidev.mygamesonline.org/amitabha_ghosh_manufacturing_science.pdfIn PDF document text
    • http://sevoxotedeki.medianewsonline.com/vadorogokodizasexogizo.pdfIn PDF document text
    • http://bonifacy.site/kolaxoxofogarefenabi307n2.pdfIn PDF document text
    • http://astropsychology.site/nilsson_riedel_electric_circuits_9th_edition_solution_manual1xdc5.pdfIn PDF document text
    • http://mnclassis.org/nomenclatura_inorganica_ejercicios_resueltosd9ph4.pdfIn PDF document text
    • https://cdn.sqhk.co/wixadigizal/je6ibPo/66078349216.pdfIn PDF document text
    • https://cdn.sqhk.co/vavefamixivi/3jcvcKj/ancient_greece_clothing_information.pdfIn PDF document text
    • http://dkblogin-de.best/pukebujelavabowamobomvkws1.pdfIn PDF document text
    • http://nakozek.mypressonline.com/what_kind_of_hydraulic_fluid_does_a_kubota_take.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/0c554f5b-f944-4ad3-9e99-ef9b7c04ee28/telibinavub.pdfIn PDF document text
    • https://73856814-13bb-4d44-aeaf-752cce6ba6bd.filesusr.com/ugd/a0d21a_f87ea80324d8433aa69c376e6a5792cc.pdf?index=trueIn PDF document text
    • https://189c2d36-84ff-4b81-9465-96c33c1d3b91.filesusr.com/ugd/35ddae_bb6e27b633a64e21a3421bf42915a307.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/76e1c2f3-44c0-4c2f-ac23-67f50eda69a5/data_analysis_software_open_source.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b0917eaa-3148-4d69-a23d-0a6f8c5115ca/beretta_a300_outlander_turkey_choke.pdfIn PDF document text
    • https://4fcc26ae-a476-48f2-98aa-cdc5c12f4544.filesusr.com/ugd/32d0e1_8be0cd2c2f904a0ba9567c4b7b63e95e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/021f1cf7-2e30-4122-a47d-37adfc569562/novena_prayer_for_the_dead_ilonggo.pdfIn PDF document text
    • https://6448a590-b571-4b71-a9e4-820b8531b153.filesusr.com/ugd/782be2_5a6756bbc38d4b78ac2e1bd99fe21f2e.pdf?index=trueIn PDF document text
    • https://b962d5b8-8819-42e3-9ba3-d95e8366760e.filesusr.com/ugd/f51585_7e073a3865344277afb19c2ee2e9b346.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/bdf05556-d2eb-4814-9f71-2646de2f3627/bosch_axxis_washing_machine_detergent_dispenser.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cdf95c92-ee73-4603-a5a8-42411f45caf8/12546749148.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b5233ac-1dc0-443b-a43f-106947589f9d/53876135029.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_off0000e824.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE824 5364 bytes
SHA-256: 2c5adf3caaa4ae7b1d47927c398ea93447a4569887d32ea5a8de925f8f84ac3b
font_01_sfnt_off0000fa62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA62 10244 bytes
SHA-256: ca4f0fd1bf549e0bf9de5e57f5ff4274195aacb7d03a8b828966fc1098e5d475
font_02_sfnt_off00011d4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D4E 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c