Malicious PDF — malware analysis report

Static analysis result for SHA-256 d37e784f31abadc1…

MALICIOUS

PDF

102.0 KB Created: 2021-03-18 19:26:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 4f38d2173290aa4cfd144ab63a7580bb SHA-1: 5f1abb63d362659165c11be6d0c53639166aa5bb SHA-256: d37e784f31abadc18d799e3b8b68581632185218e3eb4fac943155eb3251bef8
186 Risk Score

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 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://leonvi.ru/strik?utm_term=red+raku+glaze+recipe PDF link annotation
    • https://sadoxeliwuduw.weebly.com/uploads/1/3/4/0/134040540/bojibapowob-zujaw-jixos.pdfIn PDF document text
    • https://lisopivoxo.weebly.com/uploads/1/3/4/9/134901835/sadupisoz.pdfIn PDF document text
    • http://labiluwewinedu.22web.org/types_of_energy_resources_worksheet.pdfIn PDF document text
    • https://milixugaxezo.weebly.com/uploads/1/3/1/8/131856079/9276007.pdfIn PDF document text
    • https://fuvipizewovotat.weebly.com/uploads/1/3/1/0/131069886/lobogigedonebidi.pdfIn PDF document text
    • http://tetufava.iblogger.org/54780439338.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sobajagas.rf.gd/vasovagal_syncope_patient_info.pdfIn PDF document text
    • http://pifotojejanuwal.rf.gd/carrageenan_properties.pdfIn PDF document text
    • https://9e77dbea-16d6-438e-9859-4a68c5388828.filesusr.com/ugd/3225da_1c014e61927d43d2a6f7988ce2e859e3.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9b41edb9-55c9-48d2-a7e2-5962af05557d/zesixikajowapifu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d765f66-60e5-4085-8487-982f0a09273b/tintern_abbey_poem_analysis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1399894d-f1ef-4e47-9601-a8cf4423fd84/buwawokogi.pdfIn PDF document text
    • https://626fb5af-1d67-41cb-86ce-204163677ff0.filesusr.com/ugd/9d869b_59f5a7f918d2488cb95b0698d9fd71a6.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nazekisigiduz/gimiz.pdfIn PDF document text
    • https://s3.amazonaws.com/juliziwojatige/candy_crush_soda_saga_apk_for_pc.pdfIn PDF document text
    • https://176fe727-baa2-4f6f-8ab0-cddcd97ecb74.filesusr.com/ugd/45df28_6155542da16041a2942bb46378f5e13a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0c12aef1-8930-49f8-beea-e8c92abe0474/71425231183.pdfIn PDF document text
    • https://s3.amazonaws.com/lovomijelun/baby_hazel_games_for_android.pdfIn PDF document text
    • https://a8fdb364-3865-4521-a36b-e12f4de7752f.filesusr.com/ugd/e20637_deb98108bd024957a518f31265808751.pdf?index=trueIn PDF document text
    • http://moxutomib.rf.gd/burger_king_gutscheine_deutschland.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/45f49f61-ea51-4e27-a370-128eb2e7e3b0/77701501744.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000150fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x150FC 5184 bytes
SHA-256: d269f49c1fcfdf90b063a4f8f088378a083bea0af40547bca6ba114bddd01d5b
font_01_sfnt_off000162c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x162C0 11416 bytes
SHA-256: 97271e30e1579abf561d8f35d04e4b62123a9cc8f32d9a8c97f810f261021845