Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c0f25571e0c6ede…

MALICIOUS

PDF

101.6 KB Created: 2021-03-20 15:57:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 6b7e17f4aa85a0d690adc49c6686b60f SHA-1: b0e13807ded8d8edf63e1f3f11b798c477946a0b SHA-256: 8c0f25571e0c6ede5c281fde6771775ff77585723ba4ed04e426c7e8f00887b2
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous external links to other PDF documents, with one prominent link pointing to 'https://kuzutuzo.ru/123?utm_term=citrix+appdna+installation+guide'. The presence of a link farm suggests an attempt to distribute malicious content or conduct phishing by luring users to external sites. No scripts were extracted, but the structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://kuzutuzo.ru/123?utm_term=citrix+appdna+installation+guide PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4425916/normal_6020fdcb2eae0.pdfIn PDF document text
    • http://lafilubepojev.scienceontheweb.net/autoestima_baja_y_alta.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409827/normal_604156ad0ee40.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421637/normal_601df9a6bf35e.pdfIn PDF document text
    • http://bigijawiv.scienceontheweb.net/calorie_chart_app.pdfIn PDF document text
    • http://lixorajepidil.mygamesonline.org/change_management_competency_examples.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463528/normal_60538fb3d7436.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://8c805f22-5240-4a8e-9b4d-8499607ff1fc.filesusr.com/ugd/76156b_7f715c279df74a429b8e627354dcc3f7.pdf?index=trueIn PDF document text
    • https://a3de454e-1598-42bb-a259-4eb69c42f179.filesusr.com/ugd/fb5067_5c6be9028750407c83c590e851e02db1.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xukonakefules/django_template_iterate_range.pdfIn PDF document text
    • https://26c1613e-5d28-4fa3-89cb-3d2c9ab59faf.filesusr.com/ugd/fe83c3_7ed40fe3b52d4db298d97c9bd8afadef.pdf?index=trueIn PDF document text
    • https://41fe7446-7195-45c8-906d-de5e784989f9.filesusr.com/ugd/e02969_da216751c47a40a4b58fcec1aa8a5c5e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a8ff4c50-9ad0-4c79-9f07-8170447c704d/how_to_add_layers_in_sketchup_2020.pdfIn PDF document text
    • https://s3.amazonaws.com/xepululejiwof/44960463191.pdfIn PDF document text
    • https://c30b87d5-e38e-4f4c-8f61-e356d9eaafe8.filesusr.com/ugd/347120_5c379fc878284a2cb9d5ca1ec9eda9db.pdf?index=trueIn PDF document text
    • https://ae9cd3fc-a2ed-4114-aa96-dd53a7e96ab4.filesusr.com/ugd/22cbe6_887c1962a184462f868c7f21b197c76c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/ronenitevodo/69788786326.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/36bdf5b1-e596-4770-bbdb-6842fd607ce1/dulakonid.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6ee85ba3-a003-4341-8aad-d287c6e7f19c/how_to_analysis_data_in_excel_2010.pdfIn PDF document text
    • http://pimobepetokonud.myartsonline.com/pusevulixilepulugise.pdfIn PDF document text
    • https://s3.amazonaws.com/mojivikapeti/saucony_guide_iso_womens_10.pdfIn PDF document text
    • https://s3.amazonaws.com/zarusegibitumet/twilight_saga_movie_songs_free_download.pdfIn PDF document text
    • https://36fc1fe3-b646-4cc1-b6e9-de51469aea27.filesusr.com/ugd/3eb4bd_e6ac2c94ca734c148cdc542f65faf63d.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000110a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110A3 16284 bytes
SHA-256: e3bd6db0caa745b59755dfa230a107fb24a39d3db2de29002466f95e6192aa00
font_01_sfnt_off000145ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145CA 5100 bytes
SHA-256: f19f243a688b9ac6f163e27bd1bb98cfd808091adc3f3df8145e9522befebfee
font_02_sfnt_off00015727.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15727 1800 bytes
SHA-256: 51ebeec29509b87aa858d500e37ac8853184703d07d1f913ce36d8e1dc7764c0
font_03_sfnt_off00015fb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15FB5 12280 bytes
SHA-256: 9cb58263e4e7e0454abcb5d4f3fda116edf341e50a90f8852f22e95998757d1d

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