Malicious PDF — malware analysis report

Static analysis result for SHA-256 5dae9860f9f69680…

MALICIOUS

PDF

75.0 KB Created: 2021-04-04 05:00:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 05c9812dd526bf64dcf00ec91304539c SHA-1: 869b4a3f3b56a1713a14d63c344fcdabb5820efd SHA-256: 5dae9860f9f6968020df902105e3aa50fced8b96aae65d1263bdda8882e8920a
186 Risk Score

Malware Insights

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

The file is a PDF that contains a significant number of external links, many of which point to disposable domains and appear to be part of a link farm. This suggests a phishing or SEO manipulation tactic. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malware. No scripts were extracted, but the PDF structure itself is indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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/award?keyword=lymph+nodes+definition+pdf PDF link annotation
    • http://my-favshopd.online/leo_s_taiwan_night_market_pinball_machinebdx7i.pdfIn PDF document text
    • https://pupupobinizoto.weebly.com/uploads/1/3/1/3/131384436/482c76623111e1b.pdfIn PDF document text
    • https://girawosanisab.weebly.com/uploads/1/3/0/7/130740609/wipenujetuvasozofepu.pdfIn PDF document text
    • https://birogiso.weebly.com/uploads/1/3/4/6/134694086/gemidawoxobatozane.pdfIn PDF document text
    • http://stonersfranchise.com/sample_abstract_format_for_project_reportgrl1v.pdfIn PDF document text
    • https://bidoruwo.weebly.com/uploads/1/3/4/6/134651737/5ec0896427f9901.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/09f6c840-a5cd-42ee-a3ae-b46a07e82dca/what_is_computer_hardware_and_software_in_urdu.pdfIn PDF document text
    • https://f1ddcea9-c323-452c-a4d3-aaefec61e50a.filesusr.com/ugd/defd8a_a792a0b7b3b945a6aa73ee6f08da9229.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e7f96c36-0757-4c8b-be2f-6dc440f0ecc0/98950877246.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9ddf138c-0dc9-42b3-b8cf-0c50fa214eea/kevebinoruxatijuzibaside.pdfIn PDF document text
    • https://c7972686-9310-4d97-8ac3-15e828887225.filesusr.com/ugd/8a419d_a9d98fed79fd4d1691330fb4f1df52eb.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/92a44ed5-f18f-47f5-8cb8-062cab3089fb/easy_guitar_songs_for_beginners_chords_sheet_music.pdfIn PDF document text
    • https://391e4f24-9fc9-4707-ac06-338edcd9f959.filesusr.com/ugd/110ef3_700b5ff6fcfd45b0a3746285c668887b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/13729ba0-73cd-49e3-8312-f59702530c29/fender_princeton_chorus_pr82.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2d1a804e-78fb-428d-99cd-38a021201c4e/63189801863.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0b23f10b-a9ec-483c-b774-446abcda3033/67419408509.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb4506d4-aa86-4c4e-88b2-0d37a2faafa3/how_to_use_the_bissell_crosswave_pet_pro.pdfIn PDF document text
    • https://0ed7c29b-d5f2-4290-8b47-add6aa38300d.filesusr.com/ugd/32a223_13197384ff3640c6bb5fd914eff7f49b.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_off0000ea7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA7F 4984 bytes
SHA-256: e432050e3bd62923c7560c990907327af1e23e31ccebaf6573db2203eed94072
font_01_sfnt_off0000fb63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB63 10500 bytes
SHA-256: 5eccfc02d02a0537580aefc2a73a25c1d823fb0059b82a3ab683dff1a2009d3a