Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c1730211794c5be…

MALICIOUS

PDF

96.3 KB Created: 2021-03-22 15:25:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 996c0ec83eff68e6dd35e315952fc0e8 SHA-1: 57359802c573b98b0c26938827ea2aee32bf3ba1 SHA-256: 8c1730211794c5beea2f14f327b0873f8bfb6178db6722e38f26cdd1cb02eab3
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9998

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://lozipotod.ru/wix?keyword=catalyst+chemistry+lab+manual+answers PDF link annotation
    • http://titanovyi-filtr.ru/jidowutorekupadaxad59851.pdfIn PDF document text
    • https://kukuwifusebuve.weebly.com/uploads/1/3/1/4/131438412/33045a5.pdfIn PDF document text
    • http://loduxoxoba.22web.org/sintra_tour_guide.pdfIn PDF document text
    • http://rubyshup.space/12649527347fysv1.pdfIn PDF document text
    • https://japidofig.weebly.com/uploads/1/3/4/5/134503064/vijobeda.pdfIn PDF document text
    • http://natlab.ru/691825886755zq80.pdfIn PDF document text
    • http://naturalik.fun/4th_grade_math_worksheets_multi_step_word_problemsygnzq.pdfIn PDF document text
    • http://becloud.website/43584962014m09by.pdfIn PDF document text
    • https://kapupidaxor.weebly.com/uploads/1/3/5/3/135386814/5694055.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/vogubivajavofu/exponential_equations_with_logarithms_answers_with_work.pdfIn PDF document text
    • http://tipajodofo.epizy.com/91391984523.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b33b7c1a-f0f4-496e-942d-3c72431bdc9b/us_attorneys_office_sdny_jobs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/031dc3a7-35bc-44f0-8a0e-fea8ce5cb0ef/89368694431.pdfIn PDF document text
    • https://b4095e1f-5e43-4c35-8b28-ff0c3185c247.filesusr.com/ugd/9cc3de_e48d14949ebc4059bf4f22092154d36b.pdf?index=trueIn PDF document text
    • https://858e1da1-ad31-4e5b-aec0-89c59c6c71f6.filesusr.com/ugd/6240f8_f21d87190846431c8cf554992312b533.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8ecd9e28-5cf0-4f93-a293-917b9116092e/89563485486.pdfIn PDF document text
    • https://c4e42e93-254c-4ba8-b495-737f84002742.filesusr.com/ugd/ddb60a_8d0489af6a1246eda36c6c5cbca51738.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5432ba12-9174-408d-b9b9-44691bfa58b4/33061928782.pdfIn PDF document text
    • https://s3.amazonaws.com/vukusa/how_to_draw_a_dog_paw.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
    • 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_off00012451.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12451 5276 bytes
SHA-256: dc0ac1be465cfe494ce78ef8ab19cc3f772824000278a9941f7f54f8ec8bfe47
font_01_sfnt_off00013625.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13625 11748 bytes
SHA-256: 7042278d623f116a4bae62567d79013f54b79c3fa65ccfde1e57faba9fdedfae
font_02_sfnt_off00015e66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E66 16060 bytes
SHA-256: ae97ebdbf5cb6679ee3ae7f6f8963da9ec2437ada1f672a33085bc8cbe806833

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