Malicious PDF — malware analysis report

Static analysis result for SHA-256 b92524c730390b79…

MALICIOUS

PDF

75.5 KB Created: 2021-05-31 19:51:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: bd417ec48f4d4a186ebb9f6946fa437c SHA-1: e5226a03ea9f601248935bd2c4508b9ee83d1af4 SHA-256: b92524c730390b7985f380e889bec7fbff20fd2569055f5e97c7442dadf0b3fa
166 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by an ML classifier. It uses a password-protected-archive lure. 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

  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://huntic.ru/pbw?utm_term=principios+de+anatom%25C3%25ADa+y+fisiolog%25C3%25ADa+tortora+13+edici%25C3%25B3n PDF link annotation
    • https://xuwuperozaposa.weebly.com/uploads/1/3/2/3/132303395/5d5925f8.pdfIn PDF document text
    • https://tulejimukun.weebly.com/uploads/1/3/4/3/134399478/vubeda_siduforumenipow_nufekaxifebog.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379846/normal_601bb6ed3ac00.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425913/normal_600e03c092419.pdfIn PDF document text
    • https://nijajugosot.weebly.com/uploads/1/3/4/0/134042616/8295144.pdfIn PDF document text
    • https://fejawizekojiwi.weebly.com/uploads/1/3/1/4/131438151/rutuduji.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496148/normal_6020519a473ab.pdfIn PDF document text
    • https://kumupesefutevun.weebly.com/uploads/1/3/4/4/134463509/2062685.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jesababa.pbworks.com/f/lilutixazavasikope.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f1c54d96-3474-48df-a866-c5d3346833f1/key_concepts_in_geomorphology_bierman_and_montgomery.pdfIn PDF document text
    • http://kufujibumufa.pbworks.com/w/file/fetch/144412260/36910845917.pdfIn PDF document text
    • http://zopujoxobug.pbworks.com/w/file/fetch/144420690/original_crazy_frog_ringtone_download.pdfIn PDF document text
    • http://fuvesiwowegu.pbworks.com/f/supax.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ff014004-1108-48cc-baff-c41525b95d24/petopisozusifebanokaxalu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/26d36c5e-a349-4b95-b897-9440a1dea954/58144461427.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d17da22-49aa-415d-8913-7c4dc202b8b3/how_to_use_fluke_376_clamp_meter.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/834e3333-42d0-442f-a794-4973ef0730c1/70921022965.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e939401f-4a9f-4095-bafb-2c2e96a9c23e/2018_toyota_camry_hybrid_se_specs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/787df51a-54dc-49c2-8c53-69f4abd6f608/nimuwobegowubipobikilage.pdfIn PDF document text
    • http://kokoxudalux.pbworks.com/f/70866401168.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_off0000e3ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3EA 5984 bytes
SHA-256: 6a12941edc2d2624eda778a0018add7f35ee0fd3c53bdd52f0e0b9f6d2bf2afc
font_01_sfnt_off0000f804.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF804 11708 bytes
SHA-256: 6311547213cd4903c4b47da1f909f56dfa420c86087ad37a909c8c2598395c26

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