Malicious PDF — malware analysis report

Static analysis result for SHA-256 d681a98e9970f6a4…

MALICIOUS

PDF

76.1 KB Created: 2021-06-09 12:27:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: f50dbffd40bb3fc3f6d44224f9ec1238 SHA-1: d1fb2e808a04689ad8ab5003082e5b8ffcbe3fff SHA-256: d681a98e9970f6a438571a740d7d0bd181c7957ef55a726a6eccca9b45e9937a
194 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many hosted on disposable domains, suggesting a link farm designed to direct users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and embedded URLs point towards a spearphishing attachment used to redirect users to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://oniceh.ru/pbw?utm_term=logic+pro+x+project+download PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4370555/normal_5ff18861e1fee.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387939/normal_6017fb3783933.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368750/normal_60469ea0e30f4.pdfIn PDF document text
    • https://gilezetekeno.weebly.com/uploads/1/3/4/5/134596926/1061482.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416132/normal_6060034f0c877.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488315/normal_5fe73e4d439b5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413703/normal_60bfd218126cf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379474/normal_6017d4eaa44b7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488804/normal_600dc082cb844.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405925/normal_605f5dfc8f7a1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375541/normal_5fcb5570d580c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389366/normal_5fe901f899843.pdfIn PDF document text
    • https://levoveto.weebly.com/uploads/1/3/4/8/134897684/6567055.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458431/normal_604f402377e48.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4414679/normal_60b6694a97543.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vafobotigef.pbworks.com/w/file/fetch/144679350/19556321602.pdfIn PDF document text
    • http://jitijaloj.pbworks.com/w/file/fetch/144574098/pakomepamaduzatezojek.pdfIn PDF document text
    • http://sufizilofab.pbworks.com/w/file/fetch/144798477/uno_siempre_cambia_al_amor_de_su_vida.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_off0000ec2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC2D 5240 bytes
SHA-256: d504aa5d0304e41cf09e0631593e2598b4ca41cde29c5196bee3449731b924ab
font_01_sfnt_off0000fe33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE33 10884 bytes
SHA-256: 020555468473e92f11a53607ce95ca7eeeefba5f86d524fa26afbe1aad34199e

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