Malicious PDF — malware analysis report

Static analysis result for SHA-256 762a5468aa9ed8f0…

MALICIOUS

PDF

73.0 KB Created: 2021-02-07 20:03:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 5d11b44c6a03936f90cdac1c59a5faca SHA-1: 89dc44493d6cd2faefddcfe491c9dd7ec2c8624a SHA-256: 762a5468aa9ed8f0b3264517efcf34a50184becc0819bbee059b6ed6e80af07e
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV. It contains a link farm with numerous external URLs, many hosted on disposable domains, suggesting a phishing or malware distribution scheme. The document body, though heavily obfuscated, contains text related to 'Cadet college rawalpindi admission form 2018', indicating a lure to trick users into clicking the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://druttle.ru/aws?utm_term=cadet+college+rawalpindi+admission+form+2018 PDF link annotation
    • https://pewatusikowago.weebly.com/uploads/1/3/2/6/132683224/rugibubodebo-fudej-zotidaxumor-mexadumof.pdfIn PDF document text
    • https://japugaze.weebly.com/uploads/1/3/5/2/135295186/88182fb83d85.pdfIn PDF document text
    • https://cdn.sqhk.co/tesikotuk/a6OnijW/jojefezaxedigaxebe.pdfIn PDF document text
    • https://luwujapi.weebly.com/uploads/1/3/4/7/134751522/3703959.pdfIn PDF document text
    • https://sivisobimiji.weebly.com/uploads/1/3/4/7/134754783/fd11eb.pdfIn PDF document text
    • http://habercigo.com/37180606608eol99.pdfIn PDF document text
    • https://nenesezeli.weebly.com/uploads/1/3/0/7/130775424/2375591.pdfIn PDF document text
    • https://fabebebu.weebly.com/uploads/1/3/2/7/132740756/gakotewilejalimuline.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449411/normal_60191058a0bf7.pdfIn PDF document text
    • https://pugotujokodi.weebly.com/uploads/1/3/6/0/136056651/15e55fad602e.pdfIn PDF document text
    • http://heretythere.site/nineputafubiwukagynzgn.pdfIn PDF document text
    • http://eurozone.pro/sotigotomilivifozapumepeanyqj.pdfIn PDF document text
    • https://fekobuwag.weebly.com/uploads/1/3/1/8/131858403/kasinidi-tumopaxot-tatewifugubuxaj-vafenumaditefo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000de2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE2A 5992 bytes
SHA-256: 0ea0ed4c74fe62c2a2e951f74a1ea3071957d60ae386db7fd3ef197b09764026
font_01_sfnt_off0000f293.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF293 10776 bytes
SHA-256: d0dc2a9632def0a3440be0839015449b34b8a3a6b7762f723dde0a9b5bf4ecab

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