Malicious PDF — malware analysis report

Static analysis result for SHA-256 553819db429e6ab0…

MALICIOUS

PDF

81.4 KB Created: 2021-03-11 19:53:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 9d4ac58f23341b2089e5a5f492ae02e2 SHA-1: 12baa3dd341f7c6f5c401c46ffa707cc64a4e12a SHA-256: 553819db429e6ab07e78dc14dbd32d41fb98c91148b8a799f9effbfcd8dd5156
186 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous external links, with a critical heuristic identifying it as a link farm. One of the embedded URLs, 'https://soxebez.ru/wix?keyword=digital+photo+professional+4.9+manual', is suspicious and likely leads to malicious content, while others are part of a link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://soxebez.ru/wix?keyword=digital+photo+professional+4.9+manual PDF link annotation
    • http://osmosiotzs.fun/fender_hot_rod_deluxe_iv_lacquered_tweedhnba6.pdfIn PDF document text
    • http://kostlike.site/usb_bootable_windows_8_softwareganmb.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/2075f93e-9068-4a54-a233-fd976f7c59ab/what_age_group_is_georges_marvellous_medicine_for.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8d085ecb-9f87-4cdd-8fc3-4770d2d8d796/percy_jackson_greek_heroes_audiobook.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/705017e8-18b3-4987-bdbd-03df8d1a75e0/can_you_cook_rice_in_ninja_multi_cooker.pdfIn PDF document text
    • https://9e730ba1-499c-413e-9a09-8a81f8121270.filesusr.com/ugd/0a0016_d22f9c2a1e334486a6ee27508c07ea1c.pdf?index=trueIn PDF document text
    • https://9579f988-9383-433c-acf3-5fff76e0c882.filesusr.com/ugd/191a6d_8ac63f5b09e7447f8feea9e8a72c3ff5.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/567f198f-d91e-469b-b854-fe4e8a636214/29917786617.pdfIn PDF document text
    • https://5c90cfa9-af55-48e2-9430-1f3580382729.filesusr.com/ugd/e2b09b_ebbb89d5630d498c81aeab63700efb7d.pdf?index=trueIn PDF document text
    • https://e432c3f7-acc0-403b-bc7f-1b8c16782643.filesusr.com/ugd/6a4899_6911267d9da244cca957781ecfc93d41.pdf?index=trueIn PDF document text
    • https://3fb740b9-71d8-4183-8edb-de11b68c0a29.filesusr.com/ugd/1fbf8b_8c4eb2ab35f243e5857ef8398565a2aa.pdf?index=trueIn PDF document text
    • https://2f2ab42d-e0b4-4bd3-aa50-2430da1ff5fc.filesusr.com/ugd/eaf48f_debc209daaa14a43801880d5223cc09c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/be49bdc0-581a-40e6-95e9-05c9ea6d6b1a/cuanto_mide_un_terreno_de_300_metros_cuadrados.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eb19eb1a-c472-4228-8171-7734496aae1a/xipororamitufobujinogimi.pdfIn PDF document text
    • https://c8070bf9-ed42-4c5d-8eb8-ca35ee70f136.filesusr.com/ugd/d38238_751ab99b2afd4ff1a7335ede97e84a83.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f0f5b822-4338-4a8b-a494-86fb4871ce4a/retipogipez.pdfIn PDF document text
    • https://08c3cc13-1ce0-4add-927e-a3aed263473e.filesusr.com/ugd/ccf397_6377b985e86d48499b2e38cda327c1a8.pdf?index=trueIn PDF document text
    • https://5ccda086-29c7-4024-8a93-689df1f3b89c.filesusr.com/ugd/ed8107_437370d088444d4db654ff9c9f8c6bc0.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6f99c4e5-0efa-467e-b769-737ec66e77b3/73932525718.pdfIn PDF document text
    • https://d1ced4a1-fa29-4c66-b583-77209f32159a.filesusr.com/ugd/c88d8b_a8bbe1865bee45f28b7e0e256cfe7bd6.pdf?index=trueIn PDF document text
    • https://e82ff0bd-cb1a-4782-8b92-0a0fb7657660.filesusr.com/ugd/d17951_47539368e3b64e08ba3624f452d01cfc.pdf?index=trueIn PDF document text
    • https://5c817321-7c0c-448b-959d-deb1da9fd788.filesusr.com/ugd/19103d_c6175877fc8d4c00b52613581e8199d6.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f0408771-1c77-42d9-80be-1032f1106cd9/nejopoketadidirozikoga.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000100ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100FF 5592 bytes
SHA-256: c947a721784e0e125ab0a202c2f1098095d4bd4c1616baaa78780f677f593fae
font_01_sfnt_off000113eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113EB 10476 bytes
SHA-256: 73bc4d6b7d814706b67783293671cb03fe231d02422029e6d9a0b4d090a0ef30