Malicious PDF — malware analysis report

Static analysis result for SHA-256 1763b7b7fbb24b5a…

MALICIOUS

PDF

78.4 KB Created: 2021-03-01 07:39:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 31f49708acd47a77e36ce57e85e37492 SHA-1: 16b78d415dcea3846f2834f849e8a294e905ba83 SHA-256: 1763b7b7fbb24b5a257852fad984dd1f809f077867f610428b0d4456a61755f0
186 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, many hosted on disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. While no scripts were directly extracted, the PDF structure and embedded URIs point towards an attempt to leverage external resources for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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
  • 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://jacksth.ru/aws?utm_term=unearthed+arcana+warlock+of+the+deep
    • http://ziwusis.getenjoyment.net/93422855304.pdf
    • https://kelebewo.weebly.com/uploads/1/3/4/3/134359650/8381324.pdf
    • https://gilemana.weebly.com/uploads/1/3/5/3/135319463/31417e9403c2c6.pdf
    • https://malufatagu.weebly.com/uploads/1/3/0/8/130874424/mosolizira-duxaxigo.pdf
    • https://wimiwimevodozaz.weebly.com/uploads/1/3/0/8/130874111/kagupomuwi_kizaboparu.pdf
    • https://verumoxozuvije.weebly.com/uploads/1/3/1/4/131407377/5269141.pdf
    • https://nagiliju.weebly.com/uploads/1/3/1/4/131412426/madatuzi.pdf
    • https://kixumiziri.weebly.com/uploads/1/3/2/6/132681985/8773693.pdf
    • https://nidatufibamukun.weebly.com/uploads/1/3/4/1/134131265/8421579.pdf
    • https://vesovagesigopek.weebly.com/uploads/1/3/4/6/134614223/zuzivuteliparelikuda.pdf
    • http://nageramuvepom.mywebcommunity.org/gasupata.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/midizaxopazeji/monografia_de_la_cultura_chachapoyas.pdf
    • https://s3.amazonaws.com/boxujetanonikuv/future_simple_elementary_worksheet.pdf
    • http://xuvekixofeku.onlinewebshop.net/63002024546.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_off0000f7e3.bin
1c1db4cd39370c0e88b2f0bed92f1db3a3150105ba2c17bda8c69fd1807d44fd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF7E3 5212 bytes
font_01_sfnt_off000109b6.bin
a91fba1ecb25f0dc519e720b4506a6345f7b3757615fbcced8b9427aade41da1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x109B6 10208 bytes

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