Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdd6083b95fb406c…

MALICIOUS

PDF

67.9 KB Created: 2021-04-19 22:46:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 8913ff636c7517f7af385c88081cb056 SHA-1: 6c0c3833cfe0a433b08bd094c990c896c4ac29bf SHA-256: fdd6083b95fb406c05f6d3b2257d1d145c35320322c89bb7f16a57449208c605
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO poisoning tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external URLs point towards an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://resalured.ru/strik?utm_term=how+to+setup+sony+dvd+player+dvp-sr210p PDF link annotation
    • https://gidunixodon.weebly.com/uploads/1/3/5/3/135322071/887cb649c0b1db8.pdfIn PDF document text
    • http://luxibenuguk.getenjoyment.net/what_is_centralization_and_decentralization.pdfIn PDF document text
    • http://bipowilago.mywebcommunity.org/lapukufejokij.pdfIn PDF document text
    • http://tifoxikutawe.sportsontheweb.net/ruxixigukuviru.pdfIn PDF document text
    • http://ruzamaji.getenjoyment.net/anti_log_table_download.pdfIn PDF document text
    • https://vovinusowoxojik.weebly.com/uploads/1/3/4/3/134349833/juzudawupajegegi.pdfIn PDF document text
    • http://kesisofawa.mygamesonline.org/lupizuwojobesanigazulula.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481173/normal_5fc799d651cb5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446382/normal_6018cbfe5e1eb.pdfIn PDF document text
    • https://gokavebaraxev.weebly.com/uploads/1/3/5/3/135309677/8245649.pdfIn PDF document text
    • http://rupaduwovuw.getenjoyment.net/50199623346.pdfIn PDF document text
    • https://vajasefa.weebly.com/uploads/1/3/4/4/134490273/77e5fbb812.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dopovis.myartsonline.com/kujapatofubowekow.pdfIn PDF document text
    • http://ligiwekuxote.myartsonline.com/42626054540.pdfIn PDF document text
    • https://23da7c74-6e14-424a-b22a-901aa35eafb1.filesusr.com/ugd/9cc572_1aa2b1e022704ecbaf834e825f675d8d.pdf?index=trueIn PDF document text
    • https://49550882-97ce-44db-a38b-6e383bb81149.filesusr.com/ugd/062c90_fe7c93814f64461eaf0ec139c8c3c7e6.pdf?index=trueIn PDF document text
    • https://d04c2b29-3777-4fe6-aaa9-ab96f87c3324.filesusr.com/ugd/43eb95_6e33b591d34c4af095d031e7f210361f.pdf?index=trueIn PDF document text
    • https://11fe2947-f393-4df3-905d-f9f3730e834a.filesusr.com/ugd/b1b16e_3ace3a6bf3a14fe48b9a51ceecfac7fc.pdf?index=trueIn PDF document text
    • https://a0a5ada1-270c-452f-b092-d943fc6f0dc0.filesusr.com/ugd/306762_8a859569d49e4eb592feb8473969dd3b.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_off0000ca45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA45 5524 bytes
SHA-256: cec61867132c89c42911bebf7b336867f26f55a987983cc8d67c9696b4e1dd4f
font_01_sfnt_off0000dd3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD3D 10464 bytes
SHA-256: ff080989286db9345327da39c2b4e3a3f2f22b3ffa82a1d4b9f47ec20c792cc5

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