Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b49d938b978dadf…

MALICIOUS

PDF

71.3 KB Created: 2020-11-10 14:06:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: e12136b313f927cccd4cd1a44bff9668 SHA-1: b58a395178e82c0ef9c86ab3c105198f36c41b60 SHA-256: 1b49d938b978dadf8f15da09a450e2d829eef265516a9284a5dcb955933ddeb0
222 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, suggesting an attempt to lead the user to malicious content. The heuristic firings indicate this PDF is part of a link farm designed to host numerous external PDF links, likely for SEO manipulation or to distribute malware. The ML classifier and ClamAV detection strongly support its malicious nature.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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
  • 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://traffking.ru/wb?keyword=pubg%20mobile%20new%20era%20apk%20download In PDF document text
    • https://ruwadegefanum.weebly.com/uploads/1/3/4/1/134108857/3807993.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375088/normal_5f9341499d881.pdfIn PDF document text
    • https://funiwulew.weebly.com/uploads/1/3/2/8/132814073/3cdbd55ce.pdfIn PDF document text
    • https://sotubuponin.weebly.com/uploads/1/3/4/6/134644868/vojuradokenomabimeno.pdfIn PDF document text
    • https://tijujuvuxerupuz.weebly.com/uploads/1/3/4/2/134236121/5505688.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367650/normal_5f89c08b02d3b.pdfIn PDF document text
    • https://gefivepuli.weebly.com/uploads/1/3/4/6/134620723/nemigebozol-nabonuvib-womutulopem-kolepifatike.pdfIn PDF document text
    • https://panidulupeju.weebly.com/uploads/1/3/0/9/130969186/2911471.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368478/normal_5f8efefb12abd.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/1d0df7e2-a028-44c1-a6fc-10b6e4834de3/10581629912.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0a66bc83-f3cc-4e67-ae47-61dbabd1eac8/computer_crossword_puzzles_microsoft.pdfIn PDF document text
    • https://s3.amazonaws.com/pazifetanegapu/72597536961.pdfIn PDF document text
    • https://s3.amazonaws.com/mijedusovineti/hebrew_alphabet_chart.pdfIn PDF document text
    • https://s3.amazonaws.com/lewuli/88978278824.pdfIn PDF document text
    • https://s3.amazonaws.com/kesumasaka/metal_density_chart.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_off0000d8a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8A6 5400 bytes
SHA-256: 8384f5c94508b37c38477f2f455c14c7d0950cc8cc8c511e441ae702d4ea5d63
font_01_sfnt_off0000eaf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAF9 11012 bytes
SHA-256: 04419da83216ba58c624b72bcc8297bf2e618a6e98b08078d69b519f8051fc09

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