Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f52bd11ff3e4fdf…

MALICIOUS

PDF

74.2 KB Created: 2021-03-30 01:43:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 136af0275f85e18855ecd76aa54271bd SHA-1: c0cabdc3acdcb8ac8bebf9f745627f9aeb9ead6f SHA-256: 9f52bd11ff3e4fdf89d392474a1cd2a01851bdd012751800ba77cd656b791172
186 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, indicating it functions as a link farm. The heuristic 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggest this is for SEO manipulation or to direct users to malicious sites. While no scripts were extracted, the presence of numerous external URLs and the ClamAV detection as 'Pdf.Phishing.Trojan' point towards a phishing or malicious redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://golowaki.ru/award?keyword=francis+bacon+essays+pdf+download PDF link annotation
    • https://cdn.sqhk.co/tikexumivu/NJhdLhf/kalakalappu_siva_template.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420597/normal_6025bb0bd088e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369174/normal_5fc85f89bf05e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489414/normal_6004d4e5b6498.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375355/normal_5fdb2b3359707.pdfIn PDF document text
    • https://cdn.sqhk.co/dizirajeb/hLUjchj/gexej.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378608/normal_5fe1c2ed70961.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368245/normal_5fd66e972cdcb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470543/normal_5fd3a44982e32.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365606/normal_5fcce46a6bd81.pdfIn PDF document text
    • https://cdn.sqhk.co/pesegozod/ygg54jl/towajokagepakuv.pdfIn PDF document text
    • https://cdn.sqhk.co/bawusipa/7oEkkMj/38199150760.pdfIn PDF document text
    • https://cdn.sqhk.co/jurufovowufu/bP5hb9a/vector_despicable_me_direction_and_magnitude_gif.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499635/normal_600b202ddacdc.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/fbed6f4a-3021-4544-84a5-a7f6326cdb1f/nekoribifudetojazesijizuj.pdfIn PDF document text
    • https://636e06b3-920c-4898-b827-ef778bbbc101.filesusr.com/ugd/40512e_ac6eb78d082b41258b4eaa3850064954.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/af00ab54-c98e-4822-ba73-32f426a80481/guzitebak.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6f553e93-bea0-4351-8225-9aa0be6cdb3f/xunogixu.pdfIn PDF document text
    • https://d8acad56-eb9a-42d1-a06c-a695c5b02328.filesusr.com/ugd/0ad6c7_5c7d4162a56d48ea9d8917152db5c340.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/508a6fcd-048d-46b1-9bd9-cdd7c22ee566/tolezosinumujerewedopul.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3397d125-57db-4414-be85-622d8d134c47/viper_7153v_remote_programming.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0affa7a3-644b-4827-a171-b2fb09bc66cc/pegelojavi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0ef8da5a-7a64-41fe-bda4-2f638100e2a9/mitomudatixuwuvipavude.pdfIn PDF document text
    • https://6f1239e7-da96-47bf-8adb-22d47a96a9da.filesusr.com/ugd/bb5a15_1daa3aa6bc454eec810f8aaecdbeaf35.pdf?index=trueIn PDF document text
    • https://f770b3d7-c897-40e0-9323-5ad0abd91552.filesusr.com/ugd/1fa6dd_1cf4d365d66c4177b052741c2f04431c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5a309401-2a0d-4f27-828d-58c7591f8d22/92689177362.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a97d60e2-5ada-49fe-9e73-86039d2b1423/whats_coming_to_netflix_in_august_2020.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_off0000e361.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE361 5436 bytes
SHA-256: 2e1de0ac78f49f9a23694d8e474ab34f0d6aa195c4d92d1b55111152307d738c
font_01_sfnt_off0000f600.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF600 10964 bytes
SHA-256: f47bfcf55d76c4c42965ab5927b296ad636c9cc8f1f5c1f9eb0dc0ec2e1e3e88