Malicious PDF — malware analysis report

Static analysis result for SHA-256 4405d4122f7d342b…

MALICIOUS

PDF

76.0 KB Created: 2021-03-03 23:14:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 032e05ea9fb33d08b6acb2044940c9be SHA-1: 815037ecb8b954f50a35a596494fdf288e9090f2 SHA-256: 4405d4122f7d342bc7521537987b4ed6383316b446a180c3e2d5055b0f77b6dd
244 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links pointing to external PDF files, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. Several heuristics confirm this, including PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM. One URL is identified as a known malicious redirector. The ClamAV detection and ML classifier further support its malicious nature, suggesting it's used for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=rules+of+the+game+imagery+sensory In PDF document text
    • https://mirajaxudedina.weebly.com/uploads/1/3/0/7/130775596/xikedoxunopul.pdfIn PDF document text
    • http://instacopyrighthelpteam.com/uncertainty_principle_definition_economicsxdf2q.pdfIn PDF document text
    • https://jigugelelatowo.weebly.com/uploads/1/3/1/4/131437208/1937289.pdfIn PDF document text
    • https://xusalifur.weebly.com/uploads/1/3/4/1/134131705/bovilut.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382418/normal_603a59a4e596b.pdfIn PDF document text
    • https://tapituxupali.weebly.com/uploads/1/3/1/3/131382330/ligojoxeso_mukipamasatebaz_fetupufofaxi.pdfIn PDF document text
    • http://lamovingcompany.com/wikadakagooss7.pdfIn PDF document text
    • https://fijuvosezo.weebly.com/uploads/1/3/4/0/134096395/1045518.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427093/normal_5fd85d9f08738.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413223/normal_6018a0cbb3c5a.pdfIn PDF document text
    • https://bapefakujina.weebly.com/uploads/1/3/4/4/134483882/nujamesuzebape_zokikuwafawelat_noxofi.pdfIn PDF document text
    • http://vnds-super.space/suruti7vnau.pdfIn PDF document text
    • http://legendnat.space/kobuvaribafofelujivuzauwxcm.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455657/normal_6013267866f42.pdfIn PDF document text
    • http://jumpfs.space/zapajomolebedebeminow8j8vv.pdfIn PDF document text
    • http://medicalpracticementor.com/wiring_simplified_by_h.p._richter48s25.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
    • 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_off0000e148.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE148 5172 bytes
SHA-256: 6e9ffcfff313a87d7bb550c8ff875adf567652af2bdae339291a35d8a5b5765c
font_01_sfnt_off0000f2c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2C7 9972 bytes
SHA-256: 8f69b2d8b1e0f9c8f1968574047f7b1693afe48deaace78f34424661d64d8f7f
font_02_sfnt_off000114ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114FF 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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