Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb5b5118415c3f4c…

MALICIOUS

PDF

74.3 KB Created: 2021-06-10 03:01:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: f5a7624f93e17f417e506d158114b269 SHA-1: 51bbe3075c6acba04f2e881cf9b6ba7f813b4773 SHA-256: bb5b5118415c3f4cb9b0d3fa0df492ae3dc45420c5fc5f3b640d9be2e2bc7abc
134 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 and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://synerhu.ru/pbw?utm_term=integers+grade+7+worksheets+pdf PDF link annotation
    • https://kuvofexe.weebly.com/uploads/1/3/1/1/131163751/3623087.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405687/normal_601cad49e2b78.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4454820/normal_60b73a89d3e23.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4494668/normal_5ff1ce8bca1b6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380072/normal_5fe16c8fb52d2.pdfIn PDF document text
    • https://bakijowo.weebly.com/uploads/1/3/4/7/134726649/dilafil.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370280/normal_605495e7de1f7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472206/normal_60292c797c998.pdfIn PDF document text
    • https://walagikolisof.weebly.com/uploads/1/3/4/4/134494282/vewipegakaworax.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472776/normal_5fe9021e275a1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459166/normal_6047947f6fe4a.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://uploads.strikinglycdn.com/files/62476957-c4c9-4ee5-a1c4-05ce379059f4/26817250658.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eeb36f03-f977-43ed-b5e7-d64b43624e04/xugededalonijom.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9b71020b-bead-48b8-836c-10127ba8b6fa/what_to_do_when_your_kindle_wont_charge.pdfIn PDF document text
    • http://dujimowiwup.pbworks.com/f/faxobagobi.pdfIn PDF document text
    • http://pafesudive.pbworks.com/w/file/fetch/144798336/rikawajonivofekativezu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4410943e-db40-40e1-b66b-5e8b375f544d/bibogixirugupus.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5f568510-6028-4ca4-af55-80087d5d34e0/dominos_allergen_info.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d5d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5D9 5184 bytes
SHA-256: 6be91534767a6d05833c20e505519446e531e3678a710e6c23a42c4c5f6775dd
font_01_sfnt_off0000e78e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE78E 11372 bytes
SHA-256: efb3c6e61c2e1878c465c42bbd62404501b8765481567c6d6f09fba08783d52a
font_02_sfnt_off00010dcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DCD 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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