Malicious PDF — malware analysis report

Static analysis result for SHA-256 ebfcbbcac11734a1…

MALICIOUS

PDF

66.5 KB Created: 2020-11-14 04:06:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: c8fcfbad109a5ac39d1226227ba83868 SHA-1: d2ff99d05487e696fded3df25420dfe92a10012b SHA-256: ebfcbbcac11734a1f80709dda9762eeb14b5dcdcf4a29e03d2b5ee06bf589288
164 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, characteristic of a link farm, designed to obscure the true destination. One of these links, https://traffnew.ru/aws?utm_term=battleship+printable+template, is likely the primary malicious URL, while others like https://s3.amazonaws.com/zodawanuror/deadpool_rap_xforce_remix_song.pdf are part of the obfuscation. The presence of PDF_SEO_LINK_FARM and PDF_URI heuristics strongly suggests a phishing or malware distribution scheme.

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.
  • 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://traffnew.ru/aws?utm_term=battleship+printable+template PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4373997/normal_5f8c022a69236.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419630/normal_5faaa6f5337cb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374373/normal_5f8a333e50105.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372373/normal_5f9c969742d66.pdfIn PDF document text
    • https://romovemesokawaj.weebly.com/uploads/1/3/4/4/134479736/mofazuzukasenar_baxiveza_fulonaw_gebusuxivemetu.pdfIn PDF document text
    • https://putebofodabisig.weebly.com/uploads/1/3/4/3/134368176/mitajira.pdfIn PDF document text
    • https://badipixurer.weebly.com/uploads/1/3/4/4/134456466/2200647.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462066/normal_5fa3af662573d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420468/normal_5fac5264774c2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375204/normal_5fa16f588ce92.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/zodawanuror/deadpool_rap_xforce_remix_song.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2f2e4d72-1a5a-4fac-b8e5-fa8da61bb845/93645908063.pdfIn PDF document text
    • https://s3.amazonaws.com/nalifij/lies_young_women_believe_study_questions.pdfIn PDF document text
    • https://s3.amazonaws.com/wilugugo/fetobisidapemaja.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_off0000c710.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC710 5248 bytes
SHA-256: 6b20040c4731d7beaff0d6f488771cbbf8c1ba5807f189d676a462e0d3fb6a43
font_01_sfnt_off0000d8b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8B5 10852 bytes
SHA-256: 15722323c0cc9ebfc5318880f4a9019ae88ca03e75842175ce3dc731865d8c7b

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