Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e87b602e79958fc…

MALICIOUS

PDF

82.6 KB Created: 2021-03-13 18:53:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: f215998dd6d5565681ea491dd6aca6be SHA-1: 115e2972804a7f2868943b13452029f545c5689b SHA-256: 9e87b602e79958fcf3526ac1098526fab42c2a4577525caa058b3955866272d9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9996

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 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://mezovuduw.ru/123?utm_term=free+reading+worksheets+for+4th+graders PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4410217/normal_5fe81e6c1fadf.pdfIn PDF document text
    • http://ravigimojamel.mypressonline.com/como_ler_hemograma_de_cachorro.pdfIn PDF document text
    • http://libutulidux.medianewsonline.com/13_attributes_of_god_list.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485822/normal_6030a5c0dd64a.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://05b56818-8b0b-4484-a411-4f1234233f1c.filesusr.com/ugd/e49726_df89dbe64c8144039e5ec77486077fb6.pdf?index=trueIn PDF document text
    • https://36535336-4f9e-4c0a-b1ad-3385cb5d4299.filesusr.com/ugd/15ebe2_fba92eeb35694eb7b0b4358d61e1ed15.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/90b3b0a8-e6a4-48d4-bf80-991b038d7d77/lowetopumubo.pdfIn PDF document text
    • https://s3.amazonaws.com/fukezavazuj/71336741543.pdfIn PDF document text
    • http://zogoxuf.atwebpages.com/59036061752.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/808725bc-4b59-453f-b540-c33d210e7544/pl_sql_developer_jobs_in_canada.pdfIn PDF document text
    • https://69a21580-3c80-4f81-8097-1ec0bc18215d.filesusr.com/ugd/bd7df1_ceb7bb4571db4fa39007e37fcef54e1f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/82e8bfee-45de-443e-a789-590a065d40a8/debixeravukudidilot.pdfIn PDF document text
    • https://332892e0-6a2b-40ad-946e-e7c92c61c867.filesusr.com/ugd/3e5d97_78c87caa9cc74d62940dac4bfe874987.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/ligole/how_to_make_a_simple_emp_jammer.pdfIn PDF document text
    • https://5d3a3edc-1384-4eb0-a354-174dd54c13aa.filesusr.com/ugd/7f5dc5_dcfc5504ab1740308f3da5e92531145d.pdf?index=trueIn PDF document text
    • https://e082b6be-64c0-45f6-a8ff-82b9c6f476f0.filesusr.com/ugd/1479de_5efe4131e7d6405abdbfcc15fd4fa39f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f14cbcb2-89a8-493a-811b-93cab2e0c97a/35583094422.pdfIn PDF document text
    • http://niwurekatexo.atwebpages.com/gifurer.pdfIn PDF document text
    • https://a5a8f6e1-24ae-425c-880d-6f4079e3c376.filesusr.com/ugd/035627_ba03149232854d38ab492817578b8b32.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jejulurowev/faxuxawem.pdfIn PDF document text
    • https://s3.amazonaws.com/vovuzize/tujub.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_off0000f83f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF83F 5124 bytes
SHA-256: bf037ef7dcad6a64d8edfb081cbcbd23209529bbfd3aba3bbb52aa8672c60345
font_01_sfnt_off000109c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109C1 10816 bytes
SHA-256: 849922508441fffba472c8c88dd07c7835c2fa7a9ad29ff3f32cd730811fca82
font_02_sfnt_off00012e80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E80 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176