Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8d9951f111a20ec…

MALICIOUS

PDF

86.3 KB Created: 2021-04-28 13:13:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 77dcf9d22b2f1074332c3a687111c408 SHA-1: b2eb3d76e2d532a035740f2a247b3992e4bf4d11 SHA-256: e8d9951f111a20ec558a33726a1b5c12a32038c3be43a7ce2510a7e12d54e190
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 hosting, suggesting a link farm or phishing operation. The ML classifier and ClamAV detection 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 malicious sites, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://dugedepap.ru/strik?utm_term=new+testament+bible+study+assignment+bibl+104+acts PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4448746/normal_601d3879eda19.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366306/normal_60487f32adda3.pdfIn PDF document text
    • http://opensol.xyz/why_appearance_is_important_in_the_workplacevt14u.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475215/normal_5fd114d2eb90e.pdfIn PDF document text
    • http://legionmone.xyz/10030998911e6wal.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416802/normal_604b9c56187d5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456399/normal_605ba3e754e1d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462036/normal_601c60b831839.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404297/normal_5ff13d3b7a15a.pdfIn PDF document text
    • http://levantemosaic.com/wipelasubazetugewikimefivlbgf3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411245/normal_6002c40c5ccd1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366385/normal_60462a5499eda.pdfIn PDF document text
    • http://a-trvl.ru/juxizased15bh.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423136/normal_603a54d147e2a.pdfIn PDF document text
    • http://yesstore.pro/vufaxeworoxujijekagabopm1ng.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421214/normal_5fdecfa5a644a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471249/normal_600cae5019a9d.pdfIn PDF document text
    • http://pobigajik.22web.org/54538035435.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482853/normal_606d3df123f31.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vuripowumi.epizy.com/lewivasufi.pdfIn PDF document text
    • https://a8a2d6b8-6248-42a0-90a4-e25e421c2e59.filesusr.com/ugd/f63f29_67c0cf856dd24481b16960928b98f4b5.pdf?index=trueIn PDF document text
    • https://7e8267f5-6380-480e-ad72-df526eaefc07.filesusr.com/ugd/cbe325_18b78e77bd5c42ceafaf4f12c88b251f.pdf?index=trueIn PDF document text
    • https://1261df91-4e32-40b2-8b8a-4050d3c54cbb.filesusr.com/ugd/df69c1_55a3eaeb316c4114b8949f6c5fe8bcc3.pdf?index=trueIn PDF document text
    • https://61090d85-22e6-4724-b969-52a17785150c.filesusr.com/ugd/952c2e_1deeb31ff40d457c88fae49b4a786dd4.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_off00011039.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11039 5748 bytes
SHA-256: 8e6be6daed40378c5f26d6d831a28cbec2b7274e61c8abd663e2347509d22d78
font_01_sfnt_off000123df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123DF 11116 bytes
SHA-256: 9232ec7cb3df26ebd0c25a12ce43e9468089eeaca62891909e2503fd8d2a99b0