Malicious PDF — malware analysis report

Static analysis result for SHA-256 61775bd866592932…

MALICIOUS

PDF

86.3 KB Created: 2021-03-18 12:55:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: edaea13e9e2c45cefcda3031bf318215 SHA-1: b5be4386584ff298d41a5e97d2ca9f71f64a740b SHA-256: 61775bd866592932a6a87580802179e382b3929e5f6839c59956915d7083f2ab
186 Risk Score

Malware Insights

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

The PDF document contains numerous external links, many pointing to disposable hosting, and one suspicious URL that appears to be a redirector. This behavior is indicative of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to directing users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://druttle.ru/strik?utm_term=where+can+i+watch+the+new+christmas+carol PDF link annotation
    • http://zonizubiro.getenjoyment.net/georgia_drivers_license_name_format.pdfIn PDF document text
    • http://zekojotewakugag.mypressonline.com/36562916766.pdfIn PDF document text
    • http://kavelizopepi.mywebcommunity.org/seruruzopaku.pdfIn PDF document text
    • http://rasidafepu.mypressonline.com/damon_and_pythias.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/a9d5c55c-1290-4bcf-8b0e-93684253d4b6/lazarillo_de_tormes_resumen_tratado_2_y_3.pdfIn PDF document text
    • https://b7c0b8aa-2746-4b81-86ab-4dfcec723e12.filesusr.com/ugd/383078_5c050ece17fb481aa7ffd3096e09dec7.pdf?index=trueIn PDF document text
    • https://be934b08-0dcc-4e2e-8de1-c3c1c32dbfab.filesusr.com/ugd/d5415a_e3a570a0f4154e27812d56ef1f2541a5.pdf?index=trueIn PDF document text
    • https://49d0234c-aae4-472d-9cb9-6192e9e03354.filesusr.com/ugd/a63595_1a19199512db4daea4d8a6faad25de8d.pdf?index=trueIn PDF document text
    • https://86042ffc-9b62-460b-8552-fb2522205a17.filesusr.com/ugd/4f92c1_03d34ae780a541e0a238704e4c3975dc.pdf?index=trueIn PDF document text
    • https://0df22b04-17ae-4e65-9af8-3af4445b4601.filesusr.com/ugd/71fd01_6d3f10322e02443cb3816d0a1e527955.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9e0b9034-b348-4448-bedf-2f7ed1d98470/63649846318.pdfIn PDF document text
    • https://50aad03f-9d2a-47e6-be13-abd12f321b17.filesusr.com/ugd/3fd638_2e59cba9b4a84ccf84e34b90f337c6da.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7bad71cd-4af2-46a1-a603-ab052e38f4fe/67555291544.pdfIn PDF document text
    • https://0443db59-9f9d-4031-b786-8a5723798135.filesusr.com/ugd/ab62d6_ac50c914017b4d77a9c8ec63ffc7429c.pdf?index=trueIn PDF document text
    • https://48b7024d-7414-4593-b44d-ed892b96ad15.filesusr.com/ugd/3e5db3_335d0b5b5353430084ec89c08ccb1e1b.pdf?index=trueIn PDF document text
    • https://bbf05351-1c49-455c-8ea8-df349977a4d5.filesusr.com/ugd/15c6d6_f7117ee5730b47e99286ac3d7df445a0.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3791dd3a-7100-4f76-92b2-702f26930567/41031490038.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/15d24e2b-4441-416e-8752-99c034880bd6/13662697288.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b703ee49-2168-4e4e-8096-1ee3a07eaa1f/10331862146.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5632a917-44ea-41e1-861d-48e8a1b37668/11771820770.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/54fb1e83-9bdb-4b13-ae0f-6f6b6f3fff2c/7962452346.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e86888d9-3d3a-487f-8741-7a8ba39a9765/the_power_of_art_picasso_summary.pdfIn PDF document text
    • https://c183b790-cb34-49aa-848e-1a9f2b14dda3.filesusr.com/ugd/d8966e_a60fd3ade54d4da99aed25a0f80062fe.pdf?index=trueIn PDF document text
    • http://bemuvarewu.onlinewebshop.net/zazuvaw.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_off000114f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114F1 5144 bytes
SHA-256: 98f90a92f03e4bc1353db7604045e8a91c2e5a0f53dc328e7fa870dcef801416
font_01_sfnt_off0001265d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1265D 11000 bytes
SHA-256: bec984b58fc2e444b6d7034ec9990837d294e86a8c4b6d4f2b5f456fb9c3cf7d