Malicious PDF — malware analysis report

Static analysis result for SHA-256 9398cfea89157770…

MALICIOUS

PDF

78.9 KB Created: 2021-04-04 22:31:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 11038e1f615dc7ebdfff3dd5d99744f9 SHA-1: dfa6a225c572567b277d62b0270045451eb8dd46 SHA-256: 9398cfea891577709f073cd605b2c9a8abdd66431e81591b5d58c6eda99127c1
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 0.9996

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://bologen.ru/123?utm_term=1+year+calendar+template+excel PDF link annotation
    • https://vemusosafuz.weebly.com/uploads/1/3/1/3/131398108/3463608.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367311/normal_606689768cdb4.pdfIn PDF document text
    • https://cdn.sqhk.co/fubemabofof/hdgcJOv/12944406642.pdfIn PDF document text
    • https://vepimogarib.weebly.com/uploads/1/3/4/8/134856589/a5b6dd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494681/normal_600bfc32e0233.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475741/normal_6039e22a5dc1c.pdfIn PDF document text
    • https://loroxiboziniluz.weebly.com/uploads/1/3/4/4/134402159/rivom_gikaxidope_mexap.pdfIn PDF document text
    • https://sulezesolujoseg.weebly.com/uploads/1/3/1/4/131452841/3551626.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449424/normal_5ffffc3c275f5.pdfIn PDF document text
    • https://cdn.sqhk.co/xenetomapum/iVxjbgf/suronavivarekakuz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496148/normal_6004f6d802cb3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455387/normal_6041e7dcc0009.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369919/normal_601dcda0a3b7c.pdfIn PDF document text
    • https://cdn.sqhk.co/sidogorego/cXhiBjx/plant_biotechnology_journal_author_guidelines.pdfIn PDF document text
    • https://vematonejos.weebly.com/uploads/1/3/1/3/131383464/8010542.pdfIn PDF document text
    • https://tuxuboninivufos.weebly.com/uploads/1/3/4/4/134478209/kolev.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403408/normal_603a5b8addb01.pdfIn PDF document text
    • https://vafukomoruf.weebly.com/uploads/1/3/4/8/134862603/7078500.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403404/normal_601a884ce1e90.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://uploads.strikinglycdn.com/files/5d7d6792-4710-431b-b9d2-9ddccfb88880/pema_chodron_when_things_fall_apart.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf9aeba7-5d6d-4138-bbeb-05333f05f220/what_to_put_on_pizza_with_white_sauce.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_off0000ed11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED11 4796 bytes
SHA-256: 21ef7455d9e3475885c7f96ae8d4f99ce86301b815779d1147bcb2ec55d3a513
font_01_sfnt_off0000fd4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD4D 10320 bytes
SHA-256: 15d3e28ccb4b4bfc22d52afa4d9350c08354da326d2a0ea6901309841a1dc534
font_02_sfnt_off00012063.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12063 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e