Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1a636e152eaf1af…

MALICIOUS

PDF

78.8 KB Created: 2021-05-13 01:40:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: dc3799e8f75040bf0ac2ba848ba8287b SHA-1: 5e00b927af7758515a49ced187a2d2d472ebc1e8 SHA-256: c1a636e152eaf1afb63f6e2410b62b857f109b1c1bf7a3d8468eec0487b6d4d1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • 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://jumiwimov.ru/strik?utm_term=buttermilk+burnt+rice+pudding PDF link annotation
    • https://jajugodi.weebly.com/uploads/1/3/4/9/134902248/fagarorurekerojajise.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374536/normal_5ff27d1169419.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411219/normal_605091d2450f9.pdfIn PDF document text
    • https://tavadarikozo.weebly.com/uploads/1/3/5/9/135987174/184259.pdfIn PDF document text
    • http://zeludupixejufi.medianewsonline.com/31738651499.pdfIn PDF document text
    • http://goxamid.mypressonline.com/randall_thompson_alleluia.pdfIn PDF document text
    • https://zusabave.weebly.com/uploads/1/3/1/4/131406295/luroj-roveni.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365575/normal_60183b6242ffd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413713/normal_604d193052b21.pdfIn PDF document text
    • https://muwunijika.weebly.com/uploads/1/3/1/3/131398004/6266664.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385617/normal_604629fdd826b.pdfIn PDF document text
    • https://vatalinonabalix.weebly.com/uploads/1/3/4/2/134234662/ladavunep-folaxukaviweta.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378149/normal_60490a293653d.pdfIn PDF document text
    • https://kigokevorusom.weebly.com/uploads/1/3/4/7/134709893/mujidef.pdfIn PDF document text
    • http://kewatupu.scienceontheweb.net/xobiweferifiwumofape.pdfIn PDF document text
    • https://voloxamofe.weebly.com/uploads/1/3/0/8/130874475/7089878.pdfIn PDF document text
    • https://ferizovewop.weebly.com/uploads/1/3/4/8/134887996/rarumitubel_xubare.pdfIn PDF document text
    • http://jolijivik.scienceontheweb.net/rakekodarolagenug.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469116/normal_6052e50451f64.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/7810ae1d-235f-42cc-b3f9-982bc26ef169/how_to_use_innova_3040e.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d2559b73-efe9-42a8-861d-3fb48939565a/can_you_put_uncooked_oatmeal_in_smoothies.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d6b170a-edd3-4a07-a326-f8367c1569bd/howard_miller_mantel_clock_winding_key.pdfIn PDF document text
    • http://nononulavojiki.myartsonline.com/5509425149.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_off0000e9f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9F7 5028 bytes
SHA-256: 9f1d86348bcc2fcf9e1b0b7a89475c5a126e4bb41451895f479daf066f8f4bc2
font_01_sfnt_off0000faef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAEF 10672 bytes
SHA-256: 48b2f071fa89b476f9ddbfda16481d12bd103a30acdab5e1de48a1dc880c10d0
font_02_sfnt_off00011f58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F58 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e