Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca26c6568ff7c809…

MALICIOUS

PDF

113.5 KB Created: 2021-03-16 22:30:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 687bb574880a7bf199fc9da008079240 SHA-1: 6c8755a29481b5f4f922c85441219be637116eda SHA-256: ca26c6568ff7c8093c74d242279a178c4930dd8d447f43ea94cbb6d6753ed88c
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which are part of a link farm designed to appear as legitimate educational resources. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or redirection to malware. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic suggest the document's primary purpose is to distribute these malicious links.

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 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.
  • 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://maypoin.ru/wix?keyword=ixl+answer+key+8th+grade+language+arts PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4365628/normal_60122965b9a5a.pdfIn PDF document text
    • http://kaboliwup.mypressonline.com/2303521719.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368949/normal_600db3fd3c05e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444850/normal_60175c8996a95.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4502246/normal_5fd3d2a628054.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4405895/normal_5ff9f4b6ac43d.pdfIn PDF document text
    • http://fuxuxixigu.scienceontheweb.net/ikea_catalogue_2020_download.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410727/normal_5ff0b40010fd2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445326/normal_602577d4ebc84.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488336/normal_601d095f7228c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368978/normal_602b0195e1bf9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405467/normal_603f81c3bc133.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483359/normal_60048f0368f73.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476765/normal_5fce535c8a260.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://eb72eaa1-ef55-40a3-a653-f6d21bccf295.filesusr.com/ugd/54913d_7ea094dcccbe4c3fbb64b40114a87374.pdf?index=trueIn PDF document text
    • https://02314edc-d025-420b-9d62-795437f25c47.filesusr.com/ugd/4f0fc1_4a1d2604fae9434ea3694e171b1bfa14.pdf?index=trueIn PDF document text
    • https://ebd73b9a-b255-48a5-b781-2bd84b483b4c.filesusr.com/ugd/956c05_5ddb653f9ee642ac8cfec6e8ee8261ca.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00018081.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18081 5544 bytes
SHA-256: c2479fbfe3f01a70f83a58831067424e84936c4c003ac0909d4456097dc4d2eb
font_01_sfnt_off00019374.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19374 11008 bytes
SHA-256: ed746a42424b4fd26d64b1e8059acc0c389a1b73b28c9511b11551e8d4aaef24

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