Malicious PDF — malware analysis report

Static analysis result for SHA-256 5903aeb8ed494ecd…

MALICIOUS

PDF

92.6 KB Created: 2021-01-28 11:17:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 44cedeb6a453f6cd752fc750b40a5cbe SHA-1: d7063b50b8e12c24f555e7b8f19d4af98ffa3619 SHA-256: 5903aeb8ed494ecd0eb743fab0753bf899685a31e643dc6d3f54892a00b49328
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing or link farm attack. The heuristic 'PDF_SEO_LINK_FARM' indicates the presence of numerous external links, with one prominent example being 'https://cdn.sqhk.co/nalujujoso/M3Wjaha/fizefil.pdf'. The embedded URL 'https://maypoin.ru/123?utm_term=cherry+shrimp+fry+care' further supports the malicious intent by directing users to potentially harmful content. No scripts were extracted from this sample, but the structure suggests it's designed to redirect users to a network of linked documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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/123?utm_term=cherry+shrimp+fry+care PDF link annotation
    • https://cdn.sqhk.co/nalujujoso/M3Wjaha/fizefil.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454055/normal_5fdeab7441476.pdfIn PDF document text
    • https://zogazipo.weebly.com/uploads/1/3/2/3/132303407/kelaxefed-gakubegej.pdfIn PDF document text
    • https://wuxinuwizon.weebly.com/uploads/1/3/0/7/130776673/7620700.pdfIn PDF document text
    • https://lukazerud.weebly.com/uploads/1/3/4/3/134343231/sizanili-papidiparaban-nodivedapotizup.pdfIn PDF document text
    • https://nezogifoxo.weebly.com/uploads/1/3/1/6/131637357/guwidelotumidodaxu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/jarirotexab/rust_blue_keycard_guide.pdfIn PDF document text
    • http://wavudipikudela.epizy.com/betijitumanatewedazelod.pdfIn PDF document text
    • https://s3.amazonaws.com/xanunafojuloki/beelzebub_jou_no_okinimesu_batch.pdfIn PDF document text
    • https://s3.amazonaws.com/buganabowumujef/crystal_reports_training_online_free.pdfIn PDF document text
    • http://roxegubipav.epizy.com/chevrolet_suburban_2017_owners_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/lorugipopuxe/98779096197.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010bc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BC1 4840 bytes
SHA-256: bf238e3a893c36739b3fc740a9d8b23678e987fe098cdd22416595714a05488c
font_01_sfnt_off00011c36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C36 11348 bytes
SHA-256: 1621d4379645edd986ced6fd92ccee491db2677ca6d4c120975982b13e210306
font_02_sfnt_off00014263.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14263 16060 bytes
SHA-256: 99ddc6f5858eb134f8024171ebe717cbd02485c31471b921a5021903b5272953
font_03_sfnt_off000156fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x156FD 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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