Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b6529438b4199cd…

MALICIOUS

PDF

83.4 KB Created: 2021-05-13 15:01:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: a77bcdd95a9043a450e0fe7e5201a2ae SHA-1: 507414a5cbb5ffd577fb43dbc33ad24d373724df SHA-256: 0b6529438b4199cd8d388bb19c56d4092e664178087d128d01056dfffb737161
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains, suggesting a link farm or phishing operation. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external URIs suggest it's designed to redirect users to potentially malicious sites, possibly for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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
  • 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://xezojetit.ru/strik?utm_term=nutrition+guide+for+pregnancy+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4418401/normal_5fcf043e9e6b4.pdfIn PDF document text
    • http://arendaavto.taxi/wulidebojetofamuelba.pdfIn PDF document text
    • https://bigifami.weebly.com/uploads/1/3/1/4/131407708/dopokola_kusumuno_ruzunexe.pdfIn PDF document text
    • https://borotopod.weebly.com/uploads/1/3/3/9/133997632/zekowew.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388063/normal_605c13f85825d.pdfIn PDF document text
    • https://buwuxebukiz.weebly.com/uploads/1/3/1/6/131606134/5718504.pdfIn PDF document text
    • http://tugrull.com/taretilofo3nmbd.pdfIn PDF document text
    • https://fufarolobol.weebly.com/uploads/1/3/4/5/134597676/8390759.pdfIn PDF document text
    • http://puxefesezosowej.22web.org/tempstar_air_conditioning_parts.pdfIn PDF document text
    • http://ostanni.fun/wonifolawivavuwatedeqbj.pdfIn PDF document text
    • http://pixell.store/wristech_blood_pressure_monitor_error_codesx91sp.pdfIn PDF document text
    • http://kpovli.ru/5878348512062c16.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479715/normal_6003a613a845d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366305/normal_6055a22dd934d.pdfIn PDF document text
    • http://hocostyle.ru/tipewijabafiguzasoveza514q.pdfIn PDF document text
    • http://insta-sale.site/maxiscan_ms300_says_link_error9vxkn.pdfIn PDF document text
    • https://vekekugez.weebly.com/uploads/1/3/4/8/134883785/mojafebojokixolix.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
    • https://18cb0a1d-3822-48a5-9ca0-56465202bc9b.filesusr.com/ugd/96564c_be85cf1f6f4b482a98a7ccd2f56561a7.pdf?index=trueIn PDF document text
    • https://bb491b24-4c81-4ccc-8daa-bf1baeb171c2.filesusr.com/ugd/93c935_c4145193211c4dd49bef0c3fa0ef4f2c.pdf?index=trueIn PDF document text
    • http://tujanum.rf.gd/ejemplo_de_auditoria_administrativa_de_una_empresa.pdfIn PDF document text
    • https://8ed7b8cb-9bae-4def-ad9b-66b28cd11f91.filesusr.com/ugd/740d8c_1fd4530bf6ba42cd8be9ce1369416ea2.pdf?index=trueIn PDF document text
    • https://1afae0f6-9e35-4dc9-9db7-5dbf78511926.filesusr.com/ugd/afe78f_74852ba9e8ec4818a6d113bf2b33dd2d.pdf?index=trueIn PDF document text
    • https://3d7c42e8-cad9-4196-8f3c-0f210fd97588.filesusr.com/ugd/1b7c00_c054170eda6c43eb9c4032c31fa02a51.pdf?index=trueIn PDF document text
    • http://rapodebo.epizy.com/pulanezakikitofuv.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fb70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB70 5064 bytes
SHA-256: f7bd709b04be96aabdac5662aa517fbe6f58fe7028ac216e48848548fba60317
font_01_sfnt_off00010cc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CC9 10296 bytes
SHA-256: 6a4dc219de2045b52fc1c8e012f6c90de5d9c993a4d00fe1106279746195235c
font_02_sfnt_off00013002.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13002 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176