Malicious PDF — malware analysis report

Static analysis result for SHA-256 79b8eddecb6a8019…

MALICIOUS

PDF

78.0 KB Created: 2021-04-04 04:25:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 13bd33695627365e86eea756900b243a SHA-1: eef6872956abcd889bd5c76a01c57e93945b37f1 SHA-256: 79b8eddecb6a801996854c14220ae66b23cfc61139dd6ebc34cb0619b9602982
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 0.9995

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://nipisod.ru/award?keyword=buderus+gb172i+pdf PDF link annotation
    • http://wuzotevoxed.22web.org/47237197357.pdfIn PDF document text
    • https://cdn.sqhk.co/gawivoxolo/2YgGsjj/xudinosile.pdfIn PDF document text
    • https://bilugejedegigel.weebly.com/uploads/1/3/4/0/134017605/ludematinitab.pdfIn PDF document text
    • http://tufidifegoz.66ghz.com/sabifetumukezirizag.pdfIn PDF document text
    • https://wururozudarorar.weebly.com/uploads/1/3/1/3/131380521/vopadazufaxivo.pdfIn PDF document text
    • https://cdn.sqhk.co/potiribuwuf/aggSSje/biriyani_songs_making_video.pdfIn PDF document text
    • https://vikakexotokipo.weebly.com/uploads/1/3/0/9/130969200/5305693.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/451aa1b8-192f-4668-b30a-1dd20eb7010b/does_samuel_beckett_bridge_open.pdfIn PDF document text
    • https://9042e326-c85f-44e6-b9b6-0c206471fdba.filesusr.com/ugd/0d2fda_c2090de42eb3489cbb33f181bc12ffb2.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0125d3b2-753e-4164-925f-e09e8062b044/lekikavilimudovisevaze.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cea6acac-b664-4f20-b61b-d6edffa8f138/what_happens_when_rental_lease_expires_in_california.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c74fdc94-2703-4dca-ba69-d775814b75b1/85650272971.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bcebb32c-3e84-49b7-8dcc-9883c69e82b4/craftsman_18_inch_electric_chainsaw_chain.pdfIn PDF document text
    • https://ea0a6730-5b47-42bc-899c-5b27b21b32ea.filesusr.com/ugd/184298_f1748c72b2454ecea25c30cece29417e.pdf?index=trueIn PDF document text
    • https://6d8b2927-5c4d-40df-b593-c6bd35e19528.filesusr.com/ugd/1adac8_91970ab18775468cb158121e9d764d1b.pdf?index=trueIn PDF document text
    • http://tovivefi.rf.gd/graves_lol_guide_deutsch.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d767ac47-84b3-4c9b-a6d5-956622f74bbe/gotepaw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/052cb8d4-5013-48ca-9b2a-062a1a8d7886/definicion_de_filosofia_del_derecho_segun_autores.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a5347d81-86d9-4d7c-b456-f3a94579295b/77977369383.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c2c6fade-d37e-4d87-8c8b-75c38b642785/how_to_provide_sales_training.pdfIn PDF document text
    • https://5e1449e8-5ae4-4a15-bc7a-ee23795bc964.filesusr.com/ugd/3a34a5_c8bd0a75a096468fb259915ed9349ed2.pdf?index=trueIn PDF document text
    • http://tereralubo.epizy.com/urbanismo_tactico.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_off0000e752.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE752 5420 bytes
SHA-256: 31569f68843337e9b51087d4649c1b54c5deb51082496a7512c4432281df41fb
font_01_sfnt_off0000f9de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9DE 15320 bytes
SHA-256: 695bfc4be6fa7daaf09beabb22f8cd92eb101a8dbc51bea91587c802ed2f3966