Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b65675d353ab695…

MALICIOUS

PDF

86.6 KB Created: 2021-03-08 16:02:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: e9311ea199d4d1bacaa03dcfc9937bb8 SHA-1: 9e76bf13b310d6f1bb31f337325762b1b114e772 SHA-256: 2b65675d353ab6956b83462fa9e1a054d8ab3e7d6773f2505ad170b63ffa4852
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO spam campaign. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external links point towards an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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://dafemum.ru/123?utm_term=deviantart+template+photoshop PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4461483/normal_602ed09a05bd0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414691/normal_5fd17fab375fe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454304/normal_5fde7c414547b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385853/normal_5fc82c70d55ce.pdfIn PDF document text
    • http://zusevad.22web.org/41557477412.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rowesotinik.rf.gd/my_free_annual_credit_report_official_site.pdfIn PDF document text
    • http://jezirateba.rf.gd/92064450154.pdfIn PDF document text
    • https://0bef8565-087b-457a-960c-b0529baba50c.filesusr.com/ugd/638000_58b3a71fc88f46fe914359508d56ac8b.pdf?index=trueIn PDF document text
    • https://98e80eac-0673-4bf9-a3de-4132461903b3.filesusr.com/ugd/1acd69_950659e50dc544ed99dc56f16bb6f9fe.pdf?index=trueIn PDF document text
    • https://d99d9bf7-a5e0-49f2-90ac-0d1bc881463d.filesusr.com/ugd/0182ef_0af5228522414b05830636aaa7359935.pdf?index=trueIn PDF document text
    • https://3465328d-eb21-4af5-a94e-b8fdacefaafa.filesusr.com/ugd/c63bf9_6f8e0eb1cb844d26a21f7d247d803c9b.pdf?index=trueIn PDF document text
    • http://bavidoripo.epizy.com/xonavebikanawej.pdfIn PDF document text
    • https://2225f16e-b6a0-48e2-a067-d7e802b71dd4.filesusr.com/ugd/a7ada4_28a7ac2e07184f49ab6ce5c500b56be4.pdf?index=trueIn PDF document text
    • https://f62823ea-e863-4eb7-bd7c-e3bac0139ff1.filesusr.com/ugd/8c639a_faea76f56d754115912edeac8327b99e.pdf?index=trueIn PDF document text
    • https://38f9ccf9-db33-4582-994d-0ea518e52d38.filesusr.com/ugd/368de4_af298e50a4fe4ffd97dbf51b7311f1bc.pdf?index=trueIn PDF document text
    • https://ea74ff18-003d-4094-8454-8d7e15e33abb.filesusr.com/ugd/50de67_0732e9ef4a064e398eb7da5f1f703c74.pdf?index=trueIn PDF document text
    • https://67d298e0-85f4-4ad4-bf36-e1ac857e42fc.filesusr.com/ugd/b6bf5b_506ba93e9e90487b88dc83a9acf9c15b.pdf?index=trueIn PDF document text
    • https://7a1f2a0d-094a-4466-88af-72a4af93b9fa.filesusr.com/ugd/22739b_692f3cdf837442d4ba0a3757f89eab4c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rexogeguxosix/adawat_novel_free.pdfIn PDF document text
    • http://pugupokevimukov.epizy.com/23167574279.pdfIn PDF document text
    • https://s3.amazonaws.com/dozore/tn_12th_half_yearly_answer_key_2018.pdfIn PDF document text
    • https://2065f6f1-29fb-48ac-a230-4f4ab2d4b746.filesusr.com/ugd/b62953_7cb55207634041b59caf8fc62a470518.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fonibinaraj/the_bard_s_tale_apk_obb.pdfIn PDF document text
    • https://ae26bae5-b1f3-4fb2-a0ba-5d2f2d23988c.filesusr.com/ugd/aec2ea_d13612f9e7de419192d8210900220850.pdf?index=trueIn PDF document text
    • https://631ffb88-cf2d-4844-8d6b-9338a1b21cc5.filesusr.com/ugd/d24e6f_7ee8e4a0a7d04c849d1a6c399271fdaa.pdf?index=trueIn PDF document text
    • https://b9e1b105-38e0-4bbf-baad-90de1e2021e1.filesusr.com/ugd/432b07_8ff4d375b7ba458fae977b8149d22b7e.pdf?index=trueIn 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_off0001175b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1175B 5120 bytes
SHA-256: e31e634405fee41ea32c2318717cb8b6e8a1c8e9180b6d7f02167763d44a0b90
font_01_sfnt_off000128a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128A1 10548 bytes
SHA-256: 0e2efa08eb73f94400b6c414385cd61706f88a64c32bb52788a2f65c53ea11c4

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