Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe4f75a51c3ae184…

MALICIOUS

PDF

65.8 KB Created: 2020-11-10 22:21:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 34024338d516133d51dabe0e8f249487 SHA-1: 112492d357fdb92c4a436d6b69bad25676ac491c SHA-256: fe4f75a51c3ae184b9ed74dc23dbadc9660c650d3737888850cb7dbdd2013695
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, identified as a link farm, and one prominent URL related to Minecraft character creation. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or SEO manipulation. No scripts were extracted, but the PDF structure itself is used to host and distribute these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://trafffe.ru/aws?keyword=crear+personaje+de+minecraft
    • https://cdn-cms.f-static.net/uploads/4371267/normal_5f94b4c7c5055.pdf
    • https://cdn-cms.f-static.net/uploads/4413966/normal_5f98384197c18.pdf
    • https://cdn-cms.f-static.net/uploads/4384036/normal_5f9531910171a.pdf
    • https://cdn-cms.f-static.net/uploads/4369655/normal_5f89f44086273.pdf
    • https://wesujugureju.weebly.com/uploads/1/3/0/8/130874517/dawivilifadil-dugarowirowuna.pdf
    • https://kifobanirijo.weebly.com/uploads/1/3/4/5/134595275/radukomokan_takok.pdf
    • https://tevitoretej.weebly.com/uploads/1/3/2/6/132680933/638a682b7b14.pdf
    • https://buranujepexu.weebly.com/uploads/1/3/4/3/134339299/regovuxidujinixeram.pdf
    • https://tevuvusit.weebly.com/uploads/1/3/4/3/134373155/2058263.pdf
    • https://cdn-cms.f-static.net/uploads/4455660/normal_5fa5d8250bd03.pdf
    • https://cdn-cms.f-static.net/uploads/4390374/normal_5f97530ddacae.pdf
    • https://cdn-cms.f-static.net/uploads/4443371/normal_5f9c2fe5dd196.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/baxadelefofibuz/asus_router_repeater_login.pdf
    • https://uploads.strikinglycdn.com/files/95f01411-801d-4a91-86f0-e8fd57cec136/waxepoludifixutifukig.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c473.bin
5bb5cf40c6a0e6c1051317083dcbc67f080a89dea6bd2e8e7949931b52bc1985
pdf-font-stream PDF embedded font (sfnt) at offset 0xC473 5252 bytes
font_01_sfnt_off0000d63b.bin
63336d3f81fdfaed55ba721915ea37921d040702b34bcc72cfb8c4a033b64140
pdf-font-stream PDF embedded font (sfnt) at offset 0xD63B 11116 bytes