Malicious PDF — malware analysis report

Static analysis result for SHA-256 36d67c23d3a00c02…

MALICIOUS

PDF

65.6 KB Created: 2021-04-08 02:53:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 209d3155cb92f37f406033615f37a501 SHA-1: 5731c789bd378c74226f915fd60235eedb2295a8 SHA-256: 36d67c23d3a00c0229efec55842dc211eb6114b65a7005e90d0d575ca32b166d
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 5

  • 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 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://nipisod.ru/wix?keyword=clinical+coding+workout+2017+with+answers PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4390373/normal_5fdb1477ec046.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410216/normal_5ffd3e593f7d1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459337/normal_5fcc2b7512ff7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384480/normal_5fcf03a978912.pdfIn PDF document text
    • http://gepokupaburorew.mywebcommunity.org/bbc_compacta_class_11_english_solutions.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443356/normal_6049268996aea.pdfIn PDF document text
    • http://pozufopajosel.mypressonline.com/baromusalagusuromazumof.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449181/normal_605ba9d013927.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474205/normal_604b463059bb8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451350/normal_5fe70a67b0e6f.pdfIn PDF document text
    • http://nikecortez.net/kopokisijot5ore3.pdfIn PDF document text
    • http://mazikopipovix.mywebcommunity.org/bruchgleichungen_mit_lsungen.pdfIn PDF document text
    • http://maslovauto.ru/nofemikukolonenuvasezahpo3g.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369768/normal_601e580bae010.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/xalexojaxipud/61971884125.pdfIn PDF document text
    • https://s3.amazonaws.com/tokatefozude/ravish_kumar_book.pdfIn PDF document text
    • https://s3.amazonaws.com/faluzotixupi/business_information_systems_degree_uk.pdfIn PDF document text
    • http://ratobewiwigu.atwebpages.com/29028990500.pdfIn PDF document text
    • http://xabudavadeguvo.myartsonline.com/wedding_decoration_business_plan.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_off0000c4de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4DE 5668 bytes
SHA-256: 6871974b7ee93a7f0e8c6ffd2a44e35cefccef2159b4cee08ff053d33d560ea4
font_01_sfnt_off0000d842.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD842 9740 bytes
SHA-256: ab47901b1d12976215d85c8930d81dd233cec40288f8a582c587cdfbbf4e0ce6

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