Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1aa39f8b8eeb2c6…

MALICIOUS

PDF

86.2 KB Created: 2021-03-25 08:14:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: a25008bec6bf425754799894265fadc8 SHA-1: ecd8ccd895b0acd3553d583f8c65040c6af577f6 SHA-256: c1aa39f8b8eeb2c6b16e8fb4f7d8c91ef164c29222cb0585fc7dd7bac652463f
126 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many pointing to unknown or disposable domains, which is characteristic of a link farm or SEO spam campaign. The ML classifier strongly indicated maliciousness, and the presence of embedded URIs suggests an attempt to redirect users to potentially harmful content. While no scripts were extracted, the overall structure and heuristic firings point to a malicious intent to manipulate search results or lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://bologen.ru/123?utm_term=bituminous+membrane+sheet PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4476135/normal_6035685b3e789.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481820/normal_5fd16fb6ecf97.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376127/normal_60325da1cfd51.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464082/normal_6027e7d751132.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446931/normal_60101e4ba6dfe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://2d2b1dae-c014-4902-97e6-c3f1d56915cd.filesusr.com/ugd/70e5f7_4334bd5b9170458fbe43ad571086d3bd.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zonebon/11920239347.pdfIn PDF document text
    • https://9505ca4c-dfdc-4941-8fde-ded35496d0c9.filesusr.com/ugd/2097ab_c3237be560ba44f68a949b0e60215475.pdf?index=trueIn PDF document text
    • https://07f52280-50dc-49c2-beec-a2e30bf849d0.filesusr.com/ugd/7b8f90_2e25dae939054a1fb36d9a3ca9bf16f8.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f05800b2-1e17-48aa-94bb-5d0ec533ee04/how_to_reset_camera_on_mac.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e459fce9-5026-47c4-8c0c-a03af9e9cc24/lezokuvi.pdfIn PDF document text
    • https://8316a071-1c81-4729-bbc9-bb84f51c1359.filesusr.com/ugd/b2ba6b_3bbb0914d83a4c42b436caab5a04739b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e8b5490-a8b0-4fe1-b19f-7652eefdba1e/kapinipesesufulupoviromo.pdfIn PDF document text
    • https://5d9de69b-f80b-44d6-9c2d-9027806fef0b.filesusr.com/ugd/e26ad2_86cad34ad2e74498a010610214e078c8.pdf?index=trueIn PDF document text
    • https://3f735f5a-cd1c-4288-bd93-adeff6e084d9.filesusr.com/ugd/bcc0e4_480efb6e170549a6930567a7d682b550.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a2396a2b-bfd8-4eaf-8bc3-aec40f4f2070/kefafapasofe.pdfIn PDF document text
    • https://9f5bcc56-a059-4f00-ae85-604acd6a3d2d.filesusr.com/ugd/ac9354_d15c35cb43f240d3a45790fbb0023003.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a36ac7fa-b7aa-47bc-af21-cfd197398251/98506688297.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c7f4caac-fe4c-4fb0-9e4e-2253d9e21c23/nespresso_delonghi_machine_not_pumping_enough_water.pdfIn PDF document text
    • https://923a8ca3-316b-4844-b38f-9bc955ad4852.filesusr.com/ugd/312e0e_0dfcdd80d53244779cc9fd9b83b9965b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sixenogafopoj/android_emulator_linux_mint_2019.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2ca57df2-1fba-4106-a9b0-b135679d61c2/denon_avr_1513.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fcd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCD6 5084 bytes
SHA-256: 32a5b50b609ce683811339a049f313642fbd7cd9a62cbfc08fe1fd4c3ed1606a
font_01_sfnt_off00010dec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DEC 11100 bytes
SHA-256: 2e7b0bc64a80c69cade1c406ad1831b98833fede0f9b0412da7430158a14c681
font_02_sfnt_off000133e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133E1 16200 bytes
SHA-256: c3f2e5cc602854ac11dea3a3cc5130a6d78ad796c38d9a9a91f02bc175c4c028

Open this report in the interactive analyzer, or submit your own file for analysis.