Malicious PDF — malware analysis report

Static analysis result for SHA-256 b39445e5dd6d0c70…

MALICIOUS

PDF

82.8 KB Created: 2021-03-29 16:06:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 4afe6ac8a0428084099ac4c6367ed375 SHA-1: 2c02be8a92c98c65da671dfdbbefb61ebb9f9db6 SHA-256: b39445e5dd6d0c70a229f2c83e930aa84abd9f5179784905413ee08ad147d2ef
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which are hosted on disposable domains, suggesting a link farm designed to direct users to potentially malicious content. The primary malicious URL identified is https://maypoin.ru/award?keyword=love+story+in+english+pdf+file, which is likely part of a phishing or scam operation. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://maypoin.ru/award?keyword=love+story+in+english+pdf+file PDF link annotation
    • https://kewisivi.weebly.com/uploads/1/3/2/6/132681156/23fadcb6774.pdfIn PDF document text
    • https://rawoxoduzipuk.weebly.com/uploads/1/3/2/3/132302868/magofamenole_sarunozukaxolid_pipapapizun_rekiv.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/moduluzuxikari/what_is_my_love_language_quiz_heywise.pdfIn PDF document text
    • https://dca540c6-954d-4243-9f09-0921753db957.filesusr.com/ugd/974a4e_3d8a18a88a954fd68f172186ac5dbe0a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/geraromu/food_nutrition_chart.pdfIn PDF document text
    • https://s3.amazonaws.com/lanubili/57862554927.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cbd87d49-5de7-436f-987a-c526e6e9e995/windows_server_2012_r2_patch_update_history.pdfIn PDF document text
    • https://2f2ab42d-e0b4-4bd3-aa50-2430da1ff5fc.filesusr.com/ugd/eaf48f_c77aeca0e2094d6d8d60c73ee84f64f7.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/66a32a14-25a2-426e-97d5-355d801d4227/how_to_connect_a_technicolor_router.pdfIn PDF document text
    • https://484a0fbd-04e0-416f-b335-41eb3f66808b.filesusr.com/ugd/228afb_bfce677b5e2c4522b9d22412c44a3841.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wazagidonux/52041597882.pdfIn PDF document text
    • https://6d8b2927-5c4d-40df-b593-c6bd35e19528.filesusr.com/ugd/1adac8_dad306f81cb54d85be691a8ecd41b755.pdf?index=trueIn PDF document text
    • https://29aa9d28-cc9d-45fc-8d86-3718b5881c84.filesusr.com/ugd/74c34a_890798eafe51442aafdefdb6af9d53d1.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/910b8ac6-c113-497a-b28c-e7ce24170938/the_endless_river_full_album.pdfIn PDF document text
    • https://b5c4f4dd-ae1f-4f6a-908c-f463551224e4.filesusr.com/ugd/dafd60_23f4e19494b14a98aa5055051eb54089.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/da1ca8f6-f5bc-4274-a258-a2a5182c3b71/dununivikoduvugob.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4c736ec5-b0e5-48a0-9208-43108ecbefa8/linear_integrated_circuits_u_a_bakshi.pdfIn PDF document text
    • https://97783159-ced7-426e-9fbd-60d2bb3342fb.filesusr.com/ugd/00058f_b78ee17b34604652a0084199f3b58606.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rekorewexidiwo/14040010748.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ec827c21-cda5-48f8-8e16-c9bff2a7cbb8/raligof.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3f528a26-393e-4775-b009-68a03f7562f0/60495271631.pdfIn PDF document text
    • https://03f57db0-fbcf-46ec-8713-21b5992b8512.filesusr.com/ugd/455f95_2f575ea4db6e4bda9af1ee5a957608ab.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_off00010491.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10491 5196 bytes
SHA-256: 42702bc0ef9c420fb9c83fc9a5d64d8a8a250120a91a8c4a534ab63c1a563044
font_01_sfnt_off0001164a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1164A 11244 bytes
SHA-256: 7eee071541d420cbb0e186df9ebb45afb18fc660bf8fe210dc9f40e37c71a045

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