Malicious PDF — malware analysis report

Static analysis result for SHA-256 729103ae190e013c…

MALICIOUS

PDF

70.4 KB Created: 2021-03-05 17:31:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: fd0fd4236e7e3110ac5038e71235d627 SHA-1: 16a1406666fa8891c8c92f53564b3ea4da76aef4 SHA-256: 729103ae190e013c8392a33f55ae4d1cfebe7d576d5485ae700e86a206a3e4a2
194 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable domains, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing or malware distribution scheme, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://vilenefex.ru/wb?keyword=my%20herbal%20choice%20reviews PDF link annotation
    • http://kefijor.mygamesonline.org/can_i_print_a_fedex_shipping_label.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/mexesazaxasa/14871010848.pdfIn PDF document text
    • http://filosoko.onlinewebshop.net/pifemiris.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5ad3b8b3-0c29-4ccf-8801-7bc818ac12b5/39010822858.pdfIn PDF document text
    • https://s3.amazonaws.com/wokesabisevo/botekudisonuxelebizezir.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/292a6a43-3e8d-4d75-9fab-320d07ad6788/mufemipumeniwumabe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c7521b2f-1aab-4a08-ad8f-c108eff42a5b/sharp_atomic_clock_model_spc364_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/fipijife/22934941126.pdfIn PDF document text
    • http://feferabi.atwebpages.com/4412794030.pdfIn PDF document text
    • https://af1bea64-f5cd-41c2-a7c1-97f21c1aa057.filesusr.com/ugd/592671_004eea83ccf94333a87960db513eb51f.pdf?index=trueIn PDF document text
    • https://cc46d2ba-e7cf-42f8-aa62-b015a0c17ef0.filesusr.com/ugd/d180c3_47e2fc4cbb0649ebb1e613cdb6a167eb.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c9cd107d-cb2e-4730-a50a-256075c5866d/putigateme.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2be10e84-06ae-4b9a-b4cb-1bc730df8a34/how_to_change_head_on_philips_norelco.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d5c95cfd-4a77-4d2b-95db-c368e03a6588/68776735836.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/82c0f5cc-245d-49a3-bf3b-010c7056f919/lidisoloxomazelaxu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/484fa6f6-342b-441f-a8e4-e6c4f5f0fd00/nezor.pdfIn PDF document text
    • https://d427386d-3434-45d9-8802-370857a594f4.filesusr.com/ugd/accd1f_41735e3585484a2b8d71b95de388f6ae.pdf?index=trueIn PDF document text
    • https://34e223d5-b18a-4f89-96b3-7c58aa965d90.filesusr.com/ugd/440e29_4f123a92a2f0425194dadf94d8c833b6.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tumuzu/88609137187.pdfIn PDF document text
    • https://s3.amazonaws.com/dotivaf/60120816127.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_off0000d643.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD643 5288 bytes
SHA-256: 45d0a25835cf8bab4dfd48bd39ed601a36011d3cc5f68d0ca688c2ed4d7fc7da
font_01_sfnt_off0000e85c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE85C 10692 bytes
SHA-256: fd661e439a9f28bc8f3241c545232ea35aef31dadc7ea9ca2945041e84be1a0f