Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d757eaedfb315cb…

MALICIOUS

PDF

77.2 KB Created: 2021-05-19 15:32:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 770246db1dc2cb3409c3dc0ebe3b3b02 SHA-1: d7ca3396132f3def9ebeee25c9ce77c17968198e SHA-256: 3d757eaedfb315cb4ca92e04f84ff11a1eef37454da5cab04b5083eb69e362a4
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jumiwimov.ru/strik?utm_term=what+are+the+duties+of+finance+administrator PDF link annotation
    • https://semizomemakov.weebly.com/uploads/1/3/0/7/130739936/timewuxej.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383137/normal_602be42ea77e1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451375/normal_5fde36d9db52f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408170/normal_5fec88de75bf0.pdfIn PDF document text
    • https://dutilugamon.weebly.com/uploads/1/3/5/3/135301630/62ff1e54cee03.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417814/normal_604fbfeb4e7fd.pdfIn PDF document text
    • https://salewuso.weebly.com/uploads/1/3/1/3/131379029/5742603.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386834/normal_5fecc9efb22bc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446036/normal_604e2cd33acf6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485942/normal_6044fe038acec.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367905/normal_60298186991e6.pdfIn PDF document text
    • https://fatilisuwojumo.weebly.com/uploads/1/3/4/6/134652656/sezujisof_safatadapuga.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464871/normal_5fcea674136f8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426945/normal_5ffaa299b22f0.pdfIn PDF document text
    • https://miwevedadig.weebly.com/uploads/1/3/1/4/131437981/lotakitefa.pdfIn PDF document text
    • https://xuviwutub.weebly.com/uploads/1/3/4/6/134697068/2e6ea0b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458628/normal_60283247983e8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369903/normal_603b6c099eb1b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464732/normal_604465c60b904.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/jozaponi/mukukotanipidugekoxiwijax.pdfIn PDF document text
    • https://s3.amazonaws.com/saxefi/20552872967.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_off0000eed5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEED5 5244 bytes
SHA-256: e1056923e75e8b989c1cb6cb0d033f7fa40d8aff6a58c43a056424d89f052237
font_01_sfnt_off0001008d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1008D 11112 bytes
SHA-256: 775f3c7a9b14ce28803e222a955140da73a219d7813c633f873afbf264d6ddc6

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