Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8725e44a46bf2a4…

MALICIOUS

PDF

84.6 KB Created: 2021-05-29 07:34:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 3b8e2d7d5c6ccc074abe08dd7443d066 SHA-1: 16ec3080b00e92bab7132f7be7ba60e834d594a9 SHA-256: c8725e44a46bf2a4616c5e5ccc5dc8813030265a41bd46b6339abec6f8f9e81e
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a large number of external links, many of which point to disposable hosting services and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate maliciousness, with ClamAV identifying it as Pdf.Phishing.Trojan. The embedded URLs and the nature of the link farm suggest an attempt to manipulate search engine rankings or redirect users to malicious content, aligning with phishing or SEO spam tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://leonvi.ru/strik?utm_term=mini+dash+waffle+maker+instructions PDF link annotation
    • https://worizura.weebly.com/uploads/1/3/1/4/131437573/3536332.pdfIn PDF document text
    • https://wogaxorabamogak.weebly.com/uploads/1/3/4/4/134400234/5906050.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414336/normal_6062b120339c2.pdfIn PDF document text
    • https://tunikasas.weebly.com/uploads/1/3/1/4/131438809/62772.pdfIn PDF document text
    • https://xanugobolenaz.weebly.com/uploads/1/3/4/3/134371028/medixuduvokewepaf.pdfIn PDF document text
    • https://zefufewik.weebly.com/uploads/1/3/4/3/134374544/ef6a35b.pdfIn PDF document text
    • https://wasatetokis.weebly.com/uploads/1/3/4/5/134513062/jixupezunozuvi.pdfIn PDF document text
    • https://binenivav.weebly.com/uploads/1/3/4/5/134516867/4062029.pdfIn PDF document text
    • https://mitukuruzatag.weebly.com/uploads/1/3/5/3/135346955/lediwofu.pdfIn PDF document text
    • https://direnebem.weebly.com/uploads/1/3/4/6/134641367/4246949.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4505820/normal_6028e4c5130f4.pdfIn PDF document text
    • https://ritobawen.weebly.com/uploads/1/3/4/4/134486043/gatiselol.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/f34f6c2a-a0d1-4d80-99ed-cc7085ee159d/plc_programming_languages.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f4bb6d8e-52c0-46b0-81b2-712d903bf230/best_vocabulary_builder_app_for_adults.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/27e7be78-c58b-4f47-b888-35b44be4719f/quote_about_the_sun_setting.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e7eb834e-fc66-4e75-b71d-3846a95cbd6a/the_naturals_book_series_movie.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b917553-4042-43ee-bf7b-5d7a672391ad/new_york_times_best_seller_books_october_2020.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_off000109d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109D9 5420 bytes
SHA-256: 2dbac7bd808a95ae2811d56df9dd3ca65cafb55b7fc0f61fbe9292cd13312c8f
font_01_sfnt_off00011c3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C3D 12180 bytes
SHA-256: b92541e84a6dbb45f9cea7752c8474634a11a9dcce54595093fe36279b6be654

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