Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba93237d51ffa81e…

MALICIOUS

PDF

78.0 KB Created: 2021-06-09 11:14:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 86395b9663263b053046446ccd632cc9 SHA-1: 02c2a1837edacdc7a17b44633a646410c8011400 SHA-256: ba93237d51ffa81e2fbe521ef9732665b8f4171970b110b8e3ad0df4aafbfbd9
186 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, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable hosting, suggesting it functions as a link farm for SEO manipulation or to host phishing content. The presence of embedded URLs and the PDF structure itself are indicative of a malicious document, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://wastran.ru/pbw?utm_term=ek+mulakat+mein+dj+song PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4464851/normal_600c7aa02c17a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4529087/normal_606861e4d9ee9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481522/normal_601c5b7f6fa53.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473656/normal_60649cef852f6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381997/normal_605ca29f87d4a.pdfIn PDF document text
    • https://getiwojaxewife.weebly.com/uploads/1/3/4/0/134012456/a8eab8b71b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372707/normal_60ba31dd9e87b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403129/normal_5ff3e4ed402e1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393763/normal_5fe4e054590eb.pdfIn PDF document text
    • https://bekogome.weebly.com/uploads/1/3/1/4/131454098/sijokopuzijemop_sujozutomotubu_kevikiso.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469847/normal_603f079754fd7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417128/normal_5ff0446dc0ea3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413363/normal_60683118525d1.pdfIn PDF document text
    • https://morupataniseb.weebly.com/uploads/1/3/4/5/134502176/womosaxa.pdfIn PDF document text
    • https://burazukukoxuvi.weebly.com/uploads/1/3/4/0/134096138/4768d387e.pdfIn PDF document text
    • https://moguvikob.weebly.com/uploads/1/3/0/8/130874292/990e19bc18ee.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416654/normal_603ab26ec4a49.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414332/normal_5fd7985c913e4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/517aed23-f5f0-4f21-abb6-f2f5ea57d0e1/swann_security_camera_dvr_forgot_password.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cba1b310-cc19-443d-adbe-af1e465fd447/fafuvixejuwolamuxivamip.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/63c97a08-b288-4e56-9fc8-eee8e4c22691/70140783833.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7bfabfbc-55b1-48f4-b2a8-fe72e313056d/suzefufijefewu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b8336181-8dd6-47db-8d95-d677a71c1e2d/how_to_set_up_your_pole_for_catfishing.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_off0000e1a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1A3 5460 bytes
SHA-256: 6ffe2cc60e160829703569f5268a99cd8aec0d6c786c2e08ada1544391d5d1ac
font_01_sfnt_off0000f443.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF443 5148 bytes
SHA-256: f36e83fb0ecb04d2c8d7fba0c98b0f6df63ec2df2785a206b362d9913fab5d9c
font_02_sfnt_off000105c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105C0 10840 bytes
SHA-256: 6692694b51d00defe4a5d70519006770f1907cc84557c14f1c821b6f2b1cb805

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