Malicious PDF — malware analysis report

Static analysis result for SHA-256 16dcbc818075a8c1…

MALICIOUS

PDF

80.0 KB Created: 2021-05-08 17:49:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 6bb8bf238439bf86ff5127eb49570a29 SHA-1: 7216306aaaffec8c7139c050b69fc0338c30a283 SHA-256: 16dcbc818075a8c125295f3352ac7e5a5db60d808186c1bdf3db5da2b218bc5d
186 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 0.9998

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 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.
  • 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://baarspo.ru/strik?utm_term=apollo+twin+mkii+solo+core PDF link annotation
    • http://sudilufib.getenjoyment.net/simple_job_application_letter.pdfIn PDF document text
    • https://bopovajo.weebly.com/uploads/1/3/5/9/135966354/89fd6be959e6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416150/normal_5ff457b98eb68.pdfIn PDF document text
    • https://kigadipokifexi.weebly.com/uploads/1/3/0/8/130813079/3710d0.pdfIn PDF document text
    • https://zabidikigez.weebly.com/uploads/1/3/4/5/134594795/ziluwavegakemurub.pdfIn PDF document text
    • https://cdn.sqhk.co/xufatirumina/ijg04wZ/35714479549.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486772/normal_5ff353e159a98.pdfIn PDF document text
    • https://firebawoba.weebly.com/uploads/1/3/4/6/134659507/6cffee8ffb1e4.pdfIn PDF document text
    • https://cdn.sqhk.co/dakizenewa/0FbOihI/66466748613.pdfIn PDF document text
    • https://zogabugopevaluz.weebly.com/uploads/1/3/0/8/130814784/38009fd9b4ad8.pdfIn PDF document text
    • https://kadexatazi.weebly.com/uploads/1/3/4/6/134648676/2297602.pdfIn PDF document text
    • https://cdn.sqhk.co/kunimanujage/f4gdjcv/21969473681.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417122/normal_604ddd9e5a602.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387713/normal_5fc6b97dc4561.pdfIn PDF document text
    • https://kezaguwubov.weebly.com/uploads/1/3/4/6/134632481/ladibubifugizibumozo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477626/normal_5fe25e45994bf.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://77a48bbd-706a-45f8-a225-ac1cc02029d7.filesusr.com/ugd/3be48b_4d3e200e8296499b9081ec41c6f71e63.pdf?index=trueIn PDF document text
    • http://wobanunep.myartsonline.com/77447475749.pdfIn PDF document text
    • http://gozudil.onlinewebshop.net/pebasexenixikavogu.pdfIn PDF document text
    • https://810dce77-56ab-4324-823a-3549757f4eab.filesusr.com/ugd/1fad07_48924c781d684ab48b3a0126630ab7c8.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e2cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2CB 4804 bytes
SHA-256: c35a3547338347ad44db3e26d69e9bf012a4eccb3f719a46c142287bfb3b70b2
font_01_sfnt_off0000f307.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF307 20540 bytes
SHA-256: 3fa273fa0e9a206edb0351c56803cf9bc145a297c799143c031ea141821e8c78
font_02_sfnt_off0001232f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1232F 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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