Malicious PDF — malware analysis report

Static analysis result for SHA-256 87aed7b3f21a4deb…

MALICIOUS

PDF

83.9 KB Created: 2021-03-22 17:50:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: bd4f4432c9a59fd924f4e95527c318ff SHA-1: 5edcc786d6a01518a136717727228ecd26ca7b83 SHA-256: 87aed7b3f21a4debaf48d1d165d87c374aa1b71fa59ab2b8ca2d89f3b0d4b900
156 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 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://xajibur.ru/strik?utm_term=the+improper+care+and+feeding+of+husbands+summary PDF link annotation
    • https://cdn.sqhk.co/mixubiki/hfhfmtX/22379408290.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463809/normal_6045c28440340.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369766/normal_5fd10bfa3dabc.pdfIn PDF document text
    • https://cdn.sqhk.co/karapenakozi/eYhehi3/crash_car_driving_2019_usa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485321/normal_600cbbb6545d0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402267/normal_5fd0b5e6a988e.pdfIn PDF document text
    • https://cdn.sqhk.co/judawube/bhjghih/anime_furia_de_titanes_3_temporada.pdfIn PDF document text
    • https://cdn.sqhk.co/bumigorawi/chcKqhc/guzekilasesimafini.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475734/normal_5fdb9c3a2264e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470975/normal_6034d4db48c82.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4371246/normal_600513dc7b090.pdfIn PDF document text
    • https://cdn.sqhk.co/nopusixinid/hgek8zY/intercompany_reconciliation_report_sap.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368758/normal_601306cca60fb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388282/normal_5fcb02aa939ab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452853/normal_600a13753c5e8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://50037ee0-0691-4a53-bdc2-b2f8f795cfa6.filesusr.com/ugd/b41a9a_93ca385666eb4ca1b1c3dbdbc875884b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5e100631-f7ab-4261-b1f3-00be71ddb68f/1993_mercruiser_5.0_service_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/26d13bca-9477-40ca-a8ca-b003d3a6085a/moto_g6_release_date.pdfIn PDF document text
    • https://a0e9597c-cfbb-4fc1-b0e0-47ed6411b148.filesusr.com/ugd/24269e_98659c03e91043428da82497710cf19e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/afdc8601-0f65-4c3b-ab2f-cc28aca1310a/where_is_thermal_fuse_on_kenmore_elite_dryer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a3f3824c-8e60-4231-96b7-c6a04ea4b473/fasevukuxajaxixererupog.pdfIn PDF document text
    • https://af30af13-e0b7-4de0-aca7-7783c01eade2.filesusr.com/ugd/9757e7_427a8175d69548598eda6d18f0117695.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_off0001085b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1085B 5728 bytes
SHA-256: c548d0f176e41325e0f83bce3419c2d14bc7d80ddcd681c4479d5800370e40d0
font_01_sfnt_off00011bb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BB2 10780 bytes
SHA-256: d8ee545fc3e8bb22b09a511f20b88d2295aaec8f856f2505b85b7527a8124a7a

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