Malicious PDF — malware analysis report

Static analysis result for SHA-256 75d2bfebffb95d90…

MALICIOUS

PDF

88.9 KB Created: 2021-03-08 00:19:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: c383bb4de70827196b78959269e3a052 SHA-1: 5de8cd1bdf1f3faeae098d547d1140b647cf9c40 SHA-256: 75d2bfebffb95d9079fb3ceb84c258d21afc9ba6b7fed78375179cb8f3312f17
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://dugedepap.ru/aws?utm_term=xfinity+cable+box+rental+cost PDF link annotation
    • http://vixemifojetinag.sportsontheweb.net/95095543502.pdfIn PDF document text
    • https://luzulobopado.weebly.com/uploads/1/3/2/6/132681737/dozanivuze.pdfIn PDF document text
    • https://redulexaxoxega.weebly.com/uploads/1/3/0/8/130874010/guleb.pdfIn PDF document text
    • https://cdn.sqhk.co/fisoxinizo/je9Nchf/bkash_app_apk_download.pdfIn PDF document text
    • https://cdn.sqhk.co/tobowovum/VsiiTia/44502429794.pdfIn PDF document text
    • http://zaxevef.getenjoyment.net/81264952472.pdfIn PDF document text
    • http://zumewidife.mygamesonline.org/roxajapujepipalevugez.pdfIn PDF document text
    • https://wiguvebilef.weebly.com/uploads/1/3/5/3/135389097/wipukarinepa.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/e8c622b3-98cf-419a-9253-f2083fc1bbb6/how_long_for_jerky_in_a_smoker.pdfIn PDF document text
    • https://99442e0c-e188-470f-b1e9-a2082f9e7f28.filesusr.com/ugd/2274a7_6506dc8ba67c4a06823733d3a873806e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9bde8aef-d410-4fba-85b2-bfa3c6df4f1c/asus_ac2900_dual-band_wi-fi_router_rt-ac86u_review.pdfIn PDF document text
    • http://judiserod.onlinewebshop.net/guerrilla_warfare_meaning_in_telugu.pdfIn PDF document text
    • https://6f672a44-e16c-4921-a0f1-e3781c0647c5.filesusr.com/ugd/bda22a_f511a38ff8b7479b9c9f4dec94f81c30.pdf?index=trueIn PDF document text
    • https://368051e9-4199-40ea-b9a2-dc6e6f83cb3b.filesusr.com/ugd/6260fe_09a4f7eeb4c04eb9a603ddb3b392488b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1cc5893b-6bac-4658-a1a9-3825e6cc5be4/shark_vacuum_navigator_swivel_plus_manual.pdfIn PDF document text
    • https://7605d98d-8b17-4a41-9383-f5c8d5af9bcc.filesusr.com/ugd/2bed4c_e64c082b64b5453bb72d8b3d1cd4ab6d.pdf?index=trueIn PDF document text
    • http://sidepojedava.myartsonline.com/nanokumojaturezaxopa.pdfIn PDF document text
    • https://c46c713f-5e69-4c64-aad4-d86f29440f76.filesusr.com/ugd/957c7b_1baec83eef0d4567ae3738bf3bd69cb3.pdf?index=trueIn PDF document text
    • https://2a07c75e-e898-48ba-b326-4cccc82d0599.filesusr.com/ugd/ff154e_0d00514237c34dbf9c74667f4ede4e3f.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
    • 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_off00010478.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10478 5160 bytes
SHA-256: 3f0c5a3fbcedcb7aa4ca5d32f4a3505bbc06b9624c7eb04e203d3cf3b2e6955a
font_01_sfnt_off00011622.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11622 12380 bytes
SHA-256: 53ed8ddffb3af2cbef94e75229d579ce139f61d76dfda6a7e709b4d12d62bb02
font_02_sfnt_off00013f45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F45 16188 bytes
SHA-256: 66d0f489606d9c5ff4050b9b55468195e34b06defb7ed2c6495d21f9854cc902