Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c683f36f0e30f75…

MALICIOUS

PDF

35.9 KB Created: 2020-11-05 18:05:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: f6d1bc69f4b1a5da27c2867933480313 SHA-1: bc9994bd19540f8d8b1e25ea3f5f5f993f989ddd SHA-256: 3c683f36f0e30f758e820154f499bf2c599ae9a0ecf8bcc0b0a70b55cacb3e5b
104 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 an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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
  • 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://trafficel.ru/123?keyword=signing+naturally+units+1+6+answers+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4365621/normal_5f86fb714acbc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393345/normal_5f9203673d939.pdfIn PDF document text
    • https://padotugaladod.weebly.com/uploads/1/3/4/6/134615244/witoxodu-jaribasevapes-zazotabiwezuwi-luxawevigolak.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388293/normal_5f99a0265c873.pdfIn PDF document text
    • https://netaluzubik.weebly.com/uploads/1/3/0/8/130813777/5adf50a6af11.pdfIn PDF document text
    • https://dumunevebule.weebly.com/uploads/1/3/0/8/130874169/zuzuwidib-sojotasele.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387811/normal_5f94bb95334a8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392664/normal_5f8e4cddd46c8.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/pazaxazusa/64513281896.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0501/5679/8122/files/sepivogexowinad.pdfIn PDF document text
    • https://s3.amazonaws.com/niporofez/words_that_start_with_the_suffix_pre.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0493/0522/3327/files/wamamapur.pdfIn PDF document text
    • https://s3.amazonaws.com/sinamozagemoger/burglar_alarm_circuit_using_scr.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_off00004c21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4C21 5712 bytes
SHA-256: 017db7d090e8a21767804d3c2875f8ad5e416b0f6ef927fafd350a3f2ed31224
font_01_sfnt_off00005fc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5FC0 10368 bytes
SHA-256: ec0280b0f0dfbfc4e14758967f0b03b282f82728de6bbf5643da3b96fb67329e

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