Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8c8e280db09e951…

MALICIOUS

PDF

69.6 KB Created: 2021-02-20 08:18:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: d990ec824421613813189dd32ae84c66 SHA-1: 3b98ff6ce9eaccadc624ed09a1496e21b7678538 SHA-256: d8c8e280db09e951ddf4cbc41dcb117caf54c0d97c341662564f401dc4dd499a
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or redirection mechanism. The primary URL, https://bologen.ru/strik?utm_term=sat+subject+tests+scores+release+date, is likely part of a phishing or malware distribution campaign.

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.
  • 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://bologen.ru/strik?utm_term=sat+subject+tests+scores+release+date PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4383475/normal_601d3e2973915.pdfIn PDF document text
    • https://wuduzavuvavazi.weebly.com/uploads/1/3/4/6/134618101/158ddb922231.pdfIn PDF document text
    • https://sufudavinor.weebly.com/uploads/1/3/1/3/131381021/febigugukanevere.pdfIn PDF document text
    • https://bojubuloxobepi.weebly.com/uploads/1/3/0/9/130969884/lezabalaribizas.pdfIn PDF document text
    • https://fililajivivumir.weebly.com/uploads/1/3/4/4/134456316/benupe.pdfIn PDF document text
    • https://kogababofaf.weebly.com/uploads/1/3/0/9/130969162/kabisifajabivo_somugamenimup_pufibubesose.pdfIn PDF document text
    • http://salleapp.xyz/22631688222zam6q.pdfIn PDF document text
    • http://korecos.ru/35128574678ompxn.pdfIn PDF document text
    • http://teleporttur.ru/besalurovijiribirelbeg0h.pdfIn PDF document text
    • http://faxozulakevosos.iblogger.org/14731621389.pdfIn PDF document text
    • https://zabutamudosuwox.weebly.com/uploads/1/3/5/3/135345211/damor-telomudiduwob.pdfIn PDF document text
    • https://fubareno.weebly.com/uploads/1/3/1/4/131482864/wetub.pdfIn PDF document text
    • https://jozevupipe.weebly.com/uploads/1/3/5/3/135346753/faranejin.pdfIn PDF document text
    • http://helpcenterbusiness.xyz/benakodatn2huh.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xenavak.rf.gd/69762097639.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_off0000d39e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD39E 5252 bytes
SHA-256: de6c7fda03e2d122c22b68b8bbd45e7677cec9d034532de371e77639694cdee5
font_01_sfnt_off0000e57f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE57F 10620 bytes
SHA-256: 042cd822074b174a7e7f5d449cf76199c28dc291197ba658b0ba0eb2172d3357

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