Malicious PDF — malware analysis report

Static analysis result for SHA-256 da3f23b591f14101…

MALICIOUS

PDF

117.9 KB Created: 2021-04-02 17:40:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d21a0b95872e24f9d0eb35b472651eea SHA-1: 4b511958588e7795dcd8d49e94e5ba6e01333953 SHA-256: da3f23b591f1410187ff58699e6eb5ddd87b6b8775f3847db440b349ecc4a43b
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, and is flagged by ClamAV as Pdf.Phishing.Trojan. The primary malicious URL identified is https://crophysi.ru/123?utm_term=hindu+religious+books+free++pdf, which is likely part of a phishing or scam operation. No scripts were extracted, but the structure and URL distribution strongly suggest a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://crophysi.ru/123?utm_term=hindu+religious+books+free++pdf
    • https://ruzizoradum.weebly.com/uploads/1/3/4/3/134317959/segife.pdf
    • https://xomikevogonenoj.weebly.com/uploads/1/3/4/7/134743799/papupunojo-mebegukik.pdf
    • https://jozufibajas.weebly.com/uploads/1/3/0/9/130969385/585b1d0e5f.pdf
    • https://pupupobinizoto.weebly.com/uploads/1/3/1/3/131384436/bowasuxata.pdf
    • https://static.s123-cdn-static.com/uploads/4474448/normal_5ff3b0b28d2dd.pdf
    • https://cdn-cms.f-static.net/uploads/4382627/normal_601144c841a53.pdf
    • https://cdn-cms.f-static.net/uploads/4423696/normal_60208c9b82e13.pdf
    • https://cdn-cms.f-static.net/uploads/4416659/normal_603126dd486c9.pdf
    • https://cdn-cms.f-static.net/uploads/4371020/normal_604812eb0cb75.pdf
    • http://fedorahosted.org/lohit
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/31aaf1ba-f316-4b2e-9f89-db75ddd37bab/sijiroxo.pdf
    • http://xubomegixabax.epizy.com/tawilivotopakof.pdf
    • https://uploads.strikinglycdn.com/files/ac4dc10f-2fee-40e3-bddf-715894d2858a/focusrite_scarlett_2i2_studio_3rd_gen._recording_pack.pdf
    • https://uploads.strikinglycdn.com/files/45207355-66fa-4ce1-9c7c-21fa0f6c2ef1/mobufesazag.pdf
    • https://uploads.strikinglycdn.com/files/025cb20d-e95b-4aa2-b548-d25f814f8fb7/how_to_toga_with_a_bed_sheet.pdf
    • http://vavegigodal.epizy.com/rekafulavikirafiwel.pdf
    • https://uploads.strikinglycdn.com/files/ecf87406-00c8-41b1-9804-7fbcedbf40d9/how_many_carbs_are_in_a_burger_king_chicken_sandwich_without_the_bun.pdf
    • https://2987c0f4-171e-4473-b3f1-a5468658115b.filesusr.com/ugd/75ff8a_f4bd0981d34b4746a629956f916ded35.pdf?index=true
    • https://44eeb0f0-4dc9-4d8b-b3fd-cc7ace98e90e.filesusr.com/ugd/a083a1_34477f987aba41b2af2c03f5728dc4ee.pdf?index=true
    • https://uploads.strikinglycdn.com/files/e5a0fb09-2d8f-4edf-b509-f6b2f2436e70/72282058662.pdf
    • https://uploads.strikinglycdn.com/files/529ff032-39ee-46c3-9428-5564fe98cc12/wumuzajexejil.pdf
    • https://uploads.strikinglycdn.com/files/a8dc1e05-3f4e-4e69-a209-0f197db3f4f9/is_world_war_z_book_good.pdf
    • https://b1b0174c-961c-4936-87f6-765e1132391e.filesusr.com/ugd/6cf804_f22613346efc4c6cbde4155b71ed4e60.pdf?index=true
    • https://uploads.strikinglycdn.com/files/35e16312-4000-4a13-bdb0-06cff553e9ed/vobipezofegerodozekilag.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNU
    • http://www.gnu.org/copyleft/gpl.htmRegular

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_007_off0001a1c3.bin
e7d621c41aea8daa0c62262af62a85577cd545689e3bab5dd7db744bf77292a8		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1A1C3 12408 bytes
font_00_sfnt_off00015cca.bin
c7fca748bf61d02573fdfb61a8eec17a2c34ce68e9b62e57d0d4305cc80ce724		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15CCA 5164 bytes
font_01_sfnt_off00016e64.bin
7e920e56b2d69ad0a34c795437496448bdbf67ad0deb23e21458005eebd3eae5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16E64 3740 bytes
font_02_sfnt_off000179db.bin
67fea57b8f8385e44be1cd0577ed1b65d10a1ed3a0ab51bcc369b52b48ca2859		 pdf-font-stream PDF embedded font (sfnt) at offset 0x179DB 11868 bytes

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