Malicious PDF — malware analysis report

Static analysis result for SHA-256 40826fd8919546cf…

MALICIOUS

PDF

76.3 KB Created: 2021-02-26 06:55:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 5caf6a1e92925709e99419088cc26456 SHA-1: 1855f43999f4c657f817e2679d232e82230386cd SHA-256: 40826fd8919546cf9f275a3a3cfb5ae59a8419b29a29f1e11da896e858a0ebf0
226 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF document functions as a link farm, embedding numerous external links designed to lure users to potentially malicious websites. The presence of suspicious and disposable domains, coupled with a high ML classifier score and ClamAV detection, strongly indicates a phishing or malware distribution attempt. The document's primary function appears to be directing users to external resources, likely for exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9742

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.
  • Image-heavy PDF with invisible link to suspicious domain high PDF_SUSPICIOUS_LINK_LURE
    PDF is a small image-heavy lure with invisible link annotations that send the user to a suspicious high-risk-domain URI. This matches credential-phishing carriers where the visible document is only a prompt and the real collection flow happens on the linked website.
  • 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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://jottigo.ru/award?keyword=edexcel+a+level+chemistry+paper+2+2018+mark+scheme PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4460263/normal_5fcdc1e8a0c47.pdfIn PDF document text
    • https://kumazapo.weebly.com/uploads/1/3/2/7/132710765/sixisox.pdfIn PDF document text
    • http://guitar.su/kizuwimoniwebubif6lp8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4458412/normal_5fed1ddc4eae0.pdfIn PDF document text
    • https://bubosetew.weebly.com/uploads/1/3/4/5/134515161/7b43f364833.pdfIn PDF document text
    • http://megatorg.ru/smoothie_recipes_with_yogurt_and_no_milko1rnt.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484380/normal_60125d0ddb10e.pdfIn PDF document text
    • https://kabijibijeg.weebly.com/uploads/1/3/4/9/134900291/6069149.pdfIn PDF document text
    • http://anbieterbewertung-autoscoutch.com/what_is_knowledge_called_after_philosophydlk5w.pdfIn PDF document text
    • https://fajizaxaro.weebly.com/uploads/1/3/1/3/131381717/ffc0a896655e6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485318/normal_601db713dd945.pdfIn PDF document text
    • https://pexajutamog.weebly.com/uploads/1/3/4/7/134759810/xiwadu.pdfIn PDF document text
    • https://wosutazewaxutu.weebly.com/uploads/1/3/0/7/130775331/navagamomu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453740/normal_6038645eefe6b.pdfIn PDF document text
    • https://xaminipa.weebly.com/uploads/1/3/1/0/131071220/roniwoki_rekat_nobovezat_fezej.pdfIn PDF document text
    • https://miwunukeje.weebly.com/uploads/1/3/4/5/134524605/1678178.pdfIn PDF document text
    • https://kabenodetaxixum.weebly.com/uploads/1/3/4/7/134754863/8f276c3de23667.pdfIn PDF document text
    • https://fenazimo.weebly.com/uploads/1/3/4/4/134437137/fojiseligupuru-mikepejub-nupavezosa.pdfIn PDF document text
    • https://jipafedi.weebly.com/uploads/1/3/0/8/130813136/xamikinu.pdfIn PDF document text
    • http://loginwithfb.site/slide_away_lyrics_oasis_chordsn4rph.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xabenigirujufoz.epizy.com/ludexogogefojilanot.pdfIn 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_off0000f533.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF533 6084 bytes
SHA-256: aeeb3d6d56910f36c5574a81919d0d3a0ae45c7b79b9246ff7befcd39071ae44
font_01_sfnt_off000109d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109D3 11408 bytes
SHA-256: 5c91b8c88d58221355d292bf27bc2cbf7efe037b6a130c748daae908626e2699

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