Malicious PDF — malware analysis report

Static analysis result for SHA-256 91185e384a43d242…

MALICIOUS

PDF

75.3 KB Created: 2021-04-28 22:09:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: a50fd5a8f95c276fad15564867ee84df SHA-1: 738519dcc652ab834134df0d5c19ab84d6ba39f6 SHA-256: 91185e384a43d2423cd8335acdf8e2a5a7faa3022d7147f2e3739f454f434977
186 Risk Score

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 hosted on disposable domains, suggesting a link farm or phishing operation. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic further support this, indicating the document's primary purpose is to redirect users to potentially harmful external sites.

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://lozipotod.ru/strik?utm_term=how+to+have+unusual+hobbies PDF link annotation
    • https://togurugake.weebly.com/uploads/1/3/1/4/131412858/diloxesiwujokov_jurokader.pdfIn PDF document text
    • https://febelozo.weebly.com/uploads/1/3/4/5/134599394/gewulu_xubimawutuza.pdfIn PDF document text
    • http://hookup153.site/sports_team_baseball_hangaroo06mih.pdfIn PDF document text
    • http://chambre.xyz/adidas_stan_smith_platform_sneakersnr87j.pdfIn PDF document text
    • https://tejojobowadame.weebly.com/uploads/1/3/0/8/130874570/6351999.pdfIn PDF document text
    • https://sapurokegija.weebly.com/uploads/1/3/4/5/134577933/fenota_lorebafavivoni_lefebusa_wakiwalaz.pdfIn PDF document text
    • https://bifimazetaxa.weebly.com/uploads/1/3/5/3/135326975/b394aca0f.pdfIn PDF document text
    • https://xixemoxutosiseg.weebly.com/uploads/1/3/4/4/134473276/tizajukizatalo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://625f08e2-3d8e-45b5-8e8c-b95d001c5c7c.filesusr.com/ugd/d94ae5_e6740372ad25433c8dc5b1a99a480aed.pdf?index=trueIn PDF document text
    • https://11484d69-1612-41b9-9199-165df1f08223.filesusr.com/ugd/e2f197_c394242e3112478e86e64ebc78cc499c.pdf?index=trueIn PDF document text
    • https://c480cc3d-c044-45b7-a7fa-747782367dcd.filesusr.com/ugd/a26f59_c19b80a5a69447d29a831b4fffe3dbc2.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e0f1d7c0-a5ce-4eb7-9349-558b6f2aa6ef/7470838497.pdfIn PDF document text
    • https://ce83042b-5faf-46b5-bcbb-9b4d05ec7d33.filesusr.com/ugd/a31856_0ab0b9bce036444ead1d9fb53242974d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/41fa26e7-f3b7-46ba-b0ca-026c39acdf11/topijimilutisaka.pdfIn PDF document text
    • https://a22cca75-cc8f-459c-9eea-628147015b55.filesusr.com/ugd/2f8a36_c2f1928cc4294f77a5240658f1424c31.pdf?index=trueIn PDF document text
    • https://be5a03d2-cb36-429a-bb4d-4773f067dd3b.filesusr.com/ugd/b46ca8_b6f070db748a4a8ea298266485f8e523.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6ae57295-e401-4b1a-a3b9-7becfc745eb2/envisioning_definition_in_english.pdfIn PDF document text
    • https://7c3dd69e-6649-485e-b385-36acc2971cd6.filesusr.com/ugd/cf9ff1_0b61b72b5c6b455f901d87b7031dceae.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f343f84f-4e86-43d7-ba33-080a918f59f7/80987044991.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_off0000eb3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB3D 4928 bytes
SHA-256: b39d97ca066f710a91c6459830f2aae7964944fdd4284a8db5aaf03eaee73ba0
font_01_sfnt_off0000fc14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC14 10584 bytes
SHA-256: 2c39dfa8e4b94dc3aa498eb44090ba1ef389f560d926d52ff9578543f6c29a6c