Malicious PDF — malware analysis report

Static analysis result for SHA-256 53db05170b91e77c…

MALICIOUS

PDF

79.3 KB Created: 2021-03-20 21:19:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e0350221a79a019a5f8de123ed161085 SHA-1: d31d0deb9fbabb10d87a0b70c786fb1c37655b5a SHA-256: 53db05170b91e77c39a6ab454291cb15f1c8d748803a430eb351c1c27d673f17
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are obfuscated or lead to potentially malicious domains, indicating a link farm or phishing attempt. The heuristic 'PDF_SEO_LINK_FARM' strongly suggests this malicious intent. While no scripts were directly extracted, the presence of embedded URLs and the overall structure point towards an attempt to redirect users to malicious content, likely for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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.
  • 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/wix?keyword=gloria+who+might+be+my+best+friend+vocabulary+test
    • https://pegavuvusejeda.weebly.com/uploads/1/3/1/4/131483027/zuregovun.pdf
    • https://cdn.sqhk.co/zuzipogowita/iiLiavl/dashboard_cover_car_parts.pdf
    • https://jabibodusap.weebly.com/uploads/1/3/2/6/132681053/dagatikedo_taxuko.pdf
    • https://cdn.sqhk.co/kukisigafumi/vdic3Dq/whatsapp_status_video_save_app.pdf
    • https://cdn.sqhk.co/dojaxeje/jghdNGS/dorubit.pdf
    • https://pefemodadiz.weebly.com/uploads/1/3/4/5/134520562/rudori-pulugo.pdf
    • https://mozufidapu.weebly.com/uploads/1/3/4/0/134012608/d92eec.pdf
    • https://norumevi.weebly.com/uploads/1/3/0/9/130969469/veziraroxame.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://e46eb8ae-11b5-47af-91b5-79e2db369635.filesusr.com/ugd/f84671_83ceaac749f84f608a751dc0f908b699.pdf?index=true
    • https://s3.amazonaws.com/sasufufa/11544100186.pdf
    • https://1eb42bdc-3da6-4b32-b75f-4382f1721f8e.filesusr.com/ugd/35474d_05d6c62d39c84e56892cb6dbb2b1a56d.pdf?index=true
    • https://uploads.strikinglycdn.com/files/2fa2395d-14c8-4428-a440-957a99aece95/what_is_the_concept_of_pragmatism.pdf
    • https://3d3b31fc-6152-41c7-b1d4-a4af3afcce63.filesusr.com/ugd/3f8d85_ecbfc59894a04b72ae633d119a88bcf9.pdf?index=true
    • https://8aefc570-8454-48c3-bb63-d4d1067b7ce0.filesusr.com/ugd/5c9621_6c4b1041542141478f05b524ab63c6db.pdf?index=true
    • https://f55c6975-0091-4942-a106-dc80285e5f9d.filesusr.com/ugd/8a4248_e7b72fdd3f4a4481921c9d3a03f493ac.pdf?index=true
    • https://s3.amazonaws.com/doxifuba/77593844852.pdf
    • https://uploads.strikinglycdn.com/files/1761061a-7a12-4049-8120-273648288181/fagubotesitipu.pdf
    • https://95a57b4d-a24c-4412-bd87-88f4f885d252.filesusr.com/ugd/011e4b_d4e478e746f8426da2d6741e94b15c5e.pdf?index=true
    • https://76a725e8-946c-4ae9-9249-cda469d35108.filesusr.com/ugd/83c8cc_38bbdc092d514ba3a8db56e40c45c029.pdf?index=true
    • https://70848fb0-0fd0-490a-9360-2ffa38fc212c.filesusr.com/ugd/08e331_aabd708aace34effa0cd56f810b3e334.pdf?index=true
    • 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e906.bin
e83c057c641495602ba5166ad1a9df5173928cb804ea9c1cba690736c9bfed84		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE906 5740 bytes
font_01_sfnt_off0000fc84.bin
428e291399894a096f9b54fa9e557df4dc02b4e3e20f502d6693b35565075100		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC84 10808 bytes
font_02_sfnt_off0001215f.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1215F 4324 bytes

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