Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e945af6818548b3…

MALICIOUS

PDF

88.6 KB Created: 2021-04-27 07:19:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 33f9d9566516631d4441e6869f9ab08f SHA-1: 419bdfc6a1a949af8cc0ea48f435b807a679152c SHA-256: 9e945af6818548b32bd3fa51947bacd9a8959e40e294f1d740c33f7f07f26ec1
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a large number of external links, identified as a link farm. One of the primary URLs, 'https://resalured.ru/strik?utm_term=metamorphosis+book+sparknotes', is suspicious and likely leads to malicious content or phishing pages. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan.

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://resalured.ru/strik?utm_term=metamorphosis+book+sparknotes PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4392474/normal_605f7a911d014.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453335/normal_601833591bb86.pdfIn PDF document text
    • http://tulavesew.getenjoyment.net/74089153284.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408865/normal_60699b5a58aef.pdfIn PDF document text
    • http://zagejudivavi.sportsontheweb.net/2118684122.pdfIn PDF document text
    • http://jidogirikar.mygamesonline.org/simple_present_and_present_continuous_exercises_com_gabarito.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/40966927-cace-452c-a15b-2b67c92de7a4/67037537125.pdfIn PDF document text
    • https://s3.amazonaws.com/xabalaru/zozolovefeloxasofifa.pdfIn PDF document text
    • https://8eeb1f0a-0cdd-4c66-98a4-83777b49fb54.filesusr.com/ugd/64f9d2_88c83f9b3db748ada5ec2722a440698e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/79d40640-0437-4922-8688-3549badc3c39/geotechnical_engineering_companies_near_me.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/94fe77a3-e2a1-49c4-b1cc-acea35cdd9f5/how_to_teach_reading_to_child_with_dyslexia.pdfIn PDF document text
    • https://a581e706-3bf6-41fb-8978-ad4d4077590d.filesusr.com/ugd/afbe6b_bcea6e6f139440afaa0b139284a46fe2.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/50d22787-7808-48d6-8f86-959953088033/90141846045.pdfIn PDF document text
    • https://s3.amazonaws.com/juliziwojatige/dreamboxedit_3._0.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/822c8406-6b42-4fc6-abc7-37297a96a032/josalezu.pdfIn PDF document text
    • https://s3.amazonaws.com/zevutebulaworel/what_is_broadcast_receiver_android.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/94cfad5c-8c6c-4879-a861-c3d51bb8735e/87219258771.pdfIn PDF document text
    • https://5b949be5-44ef-49af-96c7-0ebaa8fe632e.filesusr.com/ugd/3402b1_1bdbfe472fab4a5683f72c14e504f6a7.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3499244d-3444-4366-8832-493e9a1129b2/the_devil_wears_prada_movie_quotes.pdfIn PDF document text
    • https://d2d87fd5-5f4d-49aa-ab3c-2263ce4b5d22.filesusr.com/ugd/9169d2_2cec0ec66c8242728c4ac4dee3779549.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c5a30f7b-4998-4a4d-a48b-7f76728d8420/oster_french_door_countertop_oven_recipes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/59e05b83-3bdc-4a6f-8b92-2879c734b9fa/lafupo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/62051375-0e0c-414e-91c5-56b6b7aa809b/is_ever_after_on_netflix_uk.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_off00011bd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BD4 5236 bytes
SHA-256: eb2faefba8ebf55c5dcc7f63c559392fe70b30155aea80adc5ba800090ac6c48
font_01_sfnt_off00012d7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D7C 12072 bytes
SHA-256: 015ae17d8191191d42363df4719ef86be17d1c402d69c461aab233ce14833787