Malicious PDF — malware analysis report

Static analysis result for SHA-256 490b20f1539cc660…

MALICIOUS

PDF

73.9 KB Created: 2021-06-07 08:57:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 15fc90c304659702d0bcb33c8b5d89bd SHA-1: 05b5f2a80b01242884e9ee9db6c3fe54ed1e24db SHA-256: 490b20f1539cc6609e7634f1ed9ac8fe8baac823de905208e56f12b0cfeccccf
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, many hosted on disposable domains, suggesting a link farm or phishing operation. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and heuristics point towards the exploitation of PDF vulnerabilities or social engineering to redirect users to malicious sites.

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
  • 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://crysiq.ru/pbw?utm_term=blockman+go+apk+download+1.34.1 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4485578/normal_60192f31478b2.pdfIn PDF document text
    • https://senaduwofajix.weebly.com/uploads/1/3/0/7/130775021/sumufobipovagef-vutemarami-fapugukamune-jinimebon.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454819/normal_5fed796ad33cb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410190/normal_604d0dff55a21.pdfIn PDF document text
    • https://fudisilutopunus.weebly.com/uploads/1/3/1/4/131438012/falezanuwibarofame.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410730/normal_6051974c95ff6.pdfIn PDF document text
    • https://favaruzikab.weebly.com/uploads/1/3/4/8/134871436/tonevaxex-dufifovaja.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384150/normal_5fd192f9d9c98.pdfIn PDF document text
    • https://kukuziso.weebly.com/uploads/1/3/4/4/134468315/minedefilijosatez.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366340/normal_604b2b49b3f47.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413563/normal_60093964c9491.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483870/normal_603e3b94ba460.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374517/normal_602ce24c38d09.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mazibudikor.pbworks.com/f/barrons_gre_verbal_workbook.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/00687198-c90c-4e07-b56f-be0109b4253f/xazolegikedujoxitokuwatol.pdfIn PDF document text
    • http://sozegajamuf.pbworks.com/w/file/fetch/144780225/wunadexejib.pdfIn PDF document text
    • http://ronuzexem.pbworks.com/f/1771435221.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f5f0678c-b35d-49cf-a519-4a8f66e6c06b/how_long_does_it_take_to_workout_to_see_results.pdfIn PDF document text
    • http://togusan.pbworks.com/w/file/fetch/144651261/astroline_mod_apk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d7aeb26-1678-42e0-9924-e59de4978631/55408872.pdfIn PDF document text
    • http://mulasamesi.pbworks.com/f/sioux_city_iowa_police_records.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_off0000e23e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE23E 5660 bytes
SHA-256: 5051ca9a16cebc13cecc73a109f89602911f4f9564a03f39c1ad8cffdbefffb7
font_01_sfnt_off0000f59f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF59F 10736 bytes
SHA-256: 74cba358388e465260830e769448ac542282c90e903bc2f1fcb63b38c46f5b72