Malicious PDF — malware analysis report

Static analysis result for SHA-256 2683e352fa9c93c3…

MALICIOUS

PDF

83.6 KB Created: 2021-04-08 00:54:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: e3506eca4a20003726d9f7172e1e27e7 SHA-1: 7eb9c2ef6f36a9879e3c0e56e046950157bd0c92 SHA-256: 2683e352fa9c93c3b7c9b4b54ec1eeb42ecefa2099d4233ccb56a9444db0dc2c
196 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to SEO-optimized PDF files, a common tactic for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded URL and the heuristic 'PDF_SEO_LINK_FARM' suggest the document is designed to redirect users to malicious sites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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/strik?utm_term=does+gregor+die+in+gregor+the+overlander PDF link annotation
    • http://fawaxifiwuzodil.scienceontheweb.net/achtung_cthulhu_espaol.pdfIn PDF document text
    • http://fiwisud.getenjoyment.net/hemorragia_digestiva_alta_por_varices_esofagicas.pdfIn PDF document text
    • https://tumuzisokume.weebly.com/uploads/1/3/5/3/135351536/1297044.pdfIn PDF document text
    • https://lijipipixeralof.weebly.com/uploads/1/3/3/9/133999964/pijid.pdfIn PDF document text
    • https://ripukalogud.weebly.com/uploads/1/3/4/3/134391837/3c230124481410.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/waduzirader/befidigolifuxobeziki.pdfIn PDF document text
    • http://pevogikuxupeja.onlinewebshop.net/aha_2020_acls_algorithms.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b9d377fa-1234-473f-a1a1-b989e2a280db/galiwu.pdfIn PDF document text
    • https://123949be-7110-4ba3-a240-a7df06fb38ce.filesusr.com/ugd/80fd5d_33eb671ef1124cdb9d0addd60aaa2917.pdf?index=trueIn PDF document text
    • http://jufogitomob.onlinewebshop.net/guitar_arpeggio_book.pdfIn PDF document text
    • https://s3.amazonaws.com/zabevog/bizawunuwunosita.pdfIn PDF document text
    • https://s3.amazonaws.com/satuja/south_african_airways_technical_training_application_form.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/68a6eefc-0bd3-4b92-b7ed-40d18b4ca71d/percy_jackson_sea_of_monsters_book.pdfIn PDF document text
    • https://9334512a-4df1-45dc-8804-f0fa1d9e2a3d.filesusr.com/ugd/9466eb_c59cbdd0b2b44558b3b514d29253eab5.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/004b8392-e244-4dfb-8463-403fb5bd0232/2005_kawasaki_bayou_250_oil_filter.pdfIn PDF document text
    • https://s3.amazonaws.com/tomamujuf/baixar_jogos_para_android_mod.pdfIn PDF document text
    • http://kewevagisugimuw.onlinewebshop.net/neuroblastoma_fisiopatologia.pdfIn PDF document text
    • https://fefcf4f0-bf52-4086-adb3-b788df03f7bd.filesusr.com/ugd/da9d4c_70d2782a66a04e0ea432c24e80998858.pdf?index=trueIn PDF document text
    • https://1f571a09-6495-4108-bd1a-9715deae29b5.filesusr.com/ugd/b0bf26_d4ae9f545fab433f86487d393bbb801c.pdf?index=trueIn 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_off00010a4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A4B 5148 bytes
SHA-256: b40d311ca288925f987335d9ef80371732ccf21146568879d3915fe69bcb8106
font_01_sfnt_off00011bd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BD4 10940 bytes
SHA-256: 814e967dba53a7b415e278e7379a662abe73abe955fb81f4c1456a7d11b5c09a