Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5658c0ab1e7b815…

MALICIOUS

PDF

71.3 KB Created: 2021-04-03 11:52:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: aed9dedb6873e133c62a8de3ab017e50 SHA-1: 094418b78233b17e73d6610934017c4814022ac0 SHA-256: a5658c0ab1e7b815e44afaa3d0866b66f831f9615b8fd3c6fdb7468ab2cdbad6
194 Risk Score

Malware Insights

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

The PDF contains a large number of external links pointing to other PDF files, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classification strongly suggests maliciousness. While no scripts were directly extracted, the nature of the link farm suggests a potential distribution mechanism for further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://golowaki.ru/award?keyword=besame+mucho+fingerstyle+guitar+tab+pdf PDF link annotation
    • http://vukuradi.mygamesonline.org/phonetics_and_phonology_by_peter_roach.pdfIn PDF document text
    • https://cdn.sqhk.co/fabukujeb/Sjc9hhe/traffic_accident_report_dmv_california.pdfIn PDF document text
    • https://talegojozafadi.weebly.com/uploads/1/3/2/3/132303005/2817044.pdfIn PDF document text
    • https://zuxusesomopekem.weebly.com/uploads/1/3/5/3/135305840/b986f18ef3aae95.pdfIn PDF document text
    • https://migawonakizize.weebly.com/uploads/1/3/1/6/131637147/satigepegolopomop.pdfIn PDF document text
    • https://cdn.sqhk.co/vafizolubev/jQR0ebD/simebidodife.pdfIn PDF document text
    • http://tezoxefakalexo.sportsontheweb.net/how_to_clean_dirt_devil_power_max_filter.pdfIn PDF document text
    • http://dejamorije.scienceontheweb.net/wowanikamutax.pdfIn PDF document text
    • http://zawugudumi.getenjoyment.net/moreover_furthermore_in_addition_exercises.pdfIn PDF document text
    • http://medazuxa.mywebcommunity.org/94935940819.pdfIn PDF document text
    • https://viwitilabepimep.weebly.com/uploads/1/3/2/6/132695477/ef3f034539489ab.pdfIn PDF document text
    • https://fajevubesupuvax.weebly.com/uploads/1/3/5/3/135387480/8804347.pdfIn PDF document text
    • https://wixokaregojes.weebly.com/uploads/1/3/2/6/132681478/9979605.pdfIn PDF document text
    • https://cdn.sqhk.co/bubiwalifeda/8UNieFN/bizepafaga.pdfIn PDF document text
    • https://cdn.sqhk.co/bonagoxe/3Thdvhb/admin_panel_dashboard_template_free.pdfIn PDF document text
    • https://gozaxuvo.weebly.com/uploads/1/3/4/6/134612917/xafasiju.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://4edd92ed-4e96-4c3d-a837-a16c7246ae9e.filesusr.com/ugd/7c3149_61b7932dc2e7417e8e7f888b011d6968.pdf?index=trueIn PDF document text
    • https://8d537faf-e869-4ed9-a29f-988560fab1dc.filesusr.com/ugd/0cce51_032d6f6489884d3f912aa2bc5aaa1438.pdf?index=trueIn PDF document text
    • https://05f6fcc2-a4c7-4d5b-b58c-97b640a93f4d.filesusr.com/ugd/74147a_8461b3b6fcd64f359f5d5776cf0456fa.pdf?index=trueIn PDF document text
    • http://nuworeri.epizy.com/385879655.pdfIn PDF document text
    • https://3c1efe6f-6e34-41bb-a2c4-2be85dd3cb33.filesusr.com/ugd/41f880_9fc249f9424c4548b636822fadc69e10.pdf?index=trueIn PDF document text
    • http://bofujenarabi.rf.gd/mugibifuvapewunipela.pdfIn PDF document text
    • http://golorawubupub.rf.gd/a_breath_of_snow_and_ashes_outlander_book_6.pdfIn PDF document text
    • https://d046670e-94b8-4ea2-8efc-69fca9b502c9.filesusr.com/ugd/c0b427_54190ade77ee4614813569d88df5feab.pdf?index=trueIn PDF document text
    • http://lipaxunuvevi.epizy.com/kendo_grid_column_template_if.pdfIn PDF document text
    • http://fopigeberafa.epizy.com/rirupodunexuloxediwijit.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_off0000d6d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6D9 5860 bytes
SHA-256: 66eb00599854cc5e0499294ba3a87cfebeff5cc6e7f0d699e744733ce0c1aba7
font_01_sfnt_off0000eaa9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAA9 10572 bytes
SHA-256: 6f03c683828026eac069a096260c7826d03cf59c200fbcc826753290e234f1d1