Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b6fb970631eeef5…

MALICIOUS

PDF

75.5 KB Created: 2021-04-26 05:24:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 95434b2fb12aaf1da77d64fa7f790b19 SHA-1: 6b5564d5effac939fb816a4cbfaa19a99d479d92 SHA-256: 5b6fb970631eeef5cbd52336bbe4703b4ff83bcc0cfe78d70749f73909eefddc
244 Risk Score

Malware Insights

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

This PDF file contains a large number of embedded links, with several pointing to known malicious redirectors and disposable hosting. The primary function appears to be acting as a link farm to distribute traffic to potentially malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/strik?utm_term=is+google+maps+free+on+android In PDF document text
    • https://cdn.sqhk.co/vekunego/4iggiRG/gemuwog.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473064/normal_5fec84244523d.pdfIn PDF document text
    • https://cdn.sqhk.co/luwibajik/hihigic/xaxesegemet.pdfIn PDF document text
    • https://cdn.sqhk.co/xegunorasu/idDY4ia/zevajobegaxizeni.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417992/normal_602707aea341b.pdfIn PDF document text
    • http://bezufosaga.iblogger.org/getuzagisoviwazidoja.pdfIn PDF document text
    • https://cdn.sqhk.co/fularulojoze/d93jfqe/xukefobaxesugemoxavoron.pdfIn PDF document text
    • https://cdn.sqhk.co/bikegola/j6ryg7x/31882365804.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417806/normal_5fcff10dca700.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tanikotik.epizy.com/16326219492.pdfIn PDF document text
    • https://e21f0dd0-e693-4a2a-aa38-6cab66162128.filesusr.com/ugd/34eed6_5d0df761cc904d5aa063b6f83f45c4ee.pdf?index=trueIn PDF document text
    • https://ce3a146a-d504-4efb-981c-4593fb85d965.filesusr.com/ugd/5b5da7_859492408ea2422da51806385bc9f346.pdf?index=trueIn PDF document text
    • https://e5058785-d3d1-442e-b0ad-d0045053dde7.filesusr.com/ugd/17c622_10339dd393864a88ab2dff6b4ec36871.pdf?index=trueIn PDF document text
    • https://f803bf1b-e1c2-47f6-a41f-c9785c88fbd4.filesusr.com/ugd/bf07b1_4cffad30173a415c9f91c53f69957fdb.pdf?index=trueIn PDF document text
    • https://0cfe495c-9a5f-46a1-a5f3-fb21b6211bac.filesusr.com/ugd/7aabb2_57d1601943ef43df93e4aec9541bc907.pdf?index=trueIn PDF document text
    • http://jimatupobosubu.rf.gd/19651935510.pdfIn PDF document text
    • https://1f49b3f1-4b09-4f89-88df-03804352fc9a.filesusr.com/ugd/a51aec_7aa052c0a2d54f3ab110cd677bb898f1.pdf?index=trueIn PDF document text
    • https://cf268418-7549-4780-9cff-e39e61b5276c.filesusr.com/ugd/0b1cf2_79cf7d4e5256409cb853dfd987a3844e.pdf?index=trueIn PDF document text
    • https://ef733714-782c-48ea-8991-1bc0bf0c95f2.filesusr.com/ugd/ad2ade_f4ab70c09d12436aaf5a637f71b4178c.pdf?index=trueIn PDF document text
    • http://popudedakajani.rf.gd/71303260866.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_off0000e8dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8DD 5296 bytes
SHA-256: 06b03bf5456bbeda135b7d46651b3e92c17266642768e5cabde1bf9b7d417252
font_01_sfnt_off0000facb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFACB 11244 bytes
SHA-256: 5a376fe8b772736e2c75f4f3199a5a73322088745724a2b9a929bc2ff0def169